🏳️⚧️ She/They, Pansexual, Lily, I make Undertale and Deltarune aus mostly
249 posts
Latest Posts by deltaswapjevil - Page 7
Im Pansexual so here's my reblog
Reblog if you're not homophobic
Every url that reblog’s will be written in a book and shown to my homophobic dad.
Reblog if you're not homophobic
Every url that reblog’s will be written in a book and shown to my homophobic dad.
Secret boss -2
Sorey guys but today and yesterday were chaotic and tiring so I don't have any secret bosses for ya
I'm super burnt out and hopefully tomorrow I'll be able to make some or flesh out the sketches I have
Also suggestions are greatly appreciated since I'm kinda running out of ideas and I feel the suggestions will also motivate me more
Thanks for the support
All people are Non-binary
If you aren't made of 1s and 0s you aren't binary
Sorry to say my friend
This isn't Undertale related but I though this was funny
Pls tell me it is
More Fetti Widow art
Ok so here's my type I guess
I was going through old drawings and found that my three gender fluid charecters all have the same dress and build
This is weirdly coincidental as Swap Jevil was already built like a cake and his dress was modeled after Alphys date dress
314 was modeled after Alphys as well so she's round and squishy and has the same dress
Lastly Fetti Widow was modeled after my friend (who doesn't have Tumblr) and she has the same build, is gender fluid, and the dress was modeled after a cake with sprinkles so by mostly coincidence all three gender fluid charecters came out as plus sized with black dresses with polka dots
Which is my type I guess
Secret boss 11...?? Correct me if I'm wrong
I loose count easily
Here's Aroce (pronounced like Aeros)
Theyre based on Aroace people (shout out to them) and how people just tend to shit on them so you know what? If people are gonna disrespect Aroace People we'll put them with the cool kids. The joker cards and spam emails
Aroce is one of the thrown out flowers and all the other flowers are talking about their boyfriends and girlfriends and Aroce feels like an outcast (mostly cause they make them feel like one)
Aroce begins to think that something is wrong with them because they can't feel the same love as everyone else and think that it's because they lack a lightner soul........oh shit not Kris!
They speak with gaps where letters should be but only when they think something is wrong with them. When they realize that they don't have to feel romantic love at the end of their fight by being shown friendship they talk normally.
Unfortunately though their realization is too late as in their fight they go super Sayans mega pissed and it drains their power tiring them out and they become a smol flower
Oh and when you first meet them only their tail is shown so it looks like Flowey
Oh and also their overalls and socks used the Aroace flag color scheme
We do not hate Aroace people here and everyone is accepted here.......
Except haters and people who put milk in before the cereal
Im STUPENDOUS
S- Suck at finishing things
T-
U-
P-
E-
N-
D-
O-
U-
S-
Idea from @npdemu
Ok so then say "JE VAIS BIFLE LA PREMIÈRE PERSONNE QUE JE VOIS SI ILS LE VEULENT OU PAS !"
Never should've told them what Bifle ment
I dare y'all to go to France and yell "IM GONNA BIFLE THE FIRST PERSON I SEE WHETHER THEY WANT IT OR NOT!"
Never should've told them what Bifle ment
Never should've told them what Bifle ment
Secret Bosses 8,9,&10
Sorry I haven't posted one of these fellas ina while but he's a few for ya
This is Fetti Widow a secret boss self insert I designed for my friend. She's a spider baker made of cake. She likes to make spider cupcake monsters and is a bit of a mad scientist. She killed her husband (fuck him). Oh and also she's at the center of the multiverse web forgot that kinda major detail. She's the plot device I use to allow my secret bosses to cross over. She runs a cafe/bar for them but is cursed with the inability to leave. So when everyone heads homes she's left there all by herself with her depression and thoughts. She's kinda like that cool grandma
Also here's some concept art I did for her and I had my friend pick her favorite. Shout out to Design F because it looks the most like a secret boss
But now more spiders. Mommy Longlegs is based on the Other Mother from Coraline. She has her doll form and then her fucked up form. She wants to make the world perfect like her family which she killed and replaced with dolls. Dolls don't break the rules, dolls don't talk back, dolls don't argue. She uses purple soul but with the ability to Parry. The purple soul works as spider web but also stitches
Lastly Cozmoze a star that once shined so brightly but soon his light faded compared to those around him. He began to spiral into the futility of it all questioning the point of it all. There are billions upon trillions of stars in the universe.....what makes you stand out. But then he turns into an Asriel God of Hyperdeath form and all hell breaks loose.
IM FINALLY THE BRIGHTEZT ZTAR!
I CAN TOUCH ALL THE ZTARZ!
I CAN EAT ALL THE ZTARZ!
I CAN KILL ALL THE ZTARZ!
THAT BLINDING LIGHT INZIDE....
KRIZ ARE YOU A ZTAR?
Hi.
How are you doing friendo?
Pretty good if I do say so myself
I'm at least relatively stable
i think...
Secret Boss 7
Thx so much for the support rlly means a lot
All this posting on this account sadly means I haven't been updating my other account @deltaswap2442 enough but follow me there to help support that project
Either way here's what we came for
Secret Boss 7 Professor Koocoo
Professor KooCoo
A secret boss for the TV based chapter three based on educational television (no one really enjoys watching that shit) especially children's educational shows and not even the fun ones like Sesame Street
The boring ones
He's also a Coocoo clock here to teach you about: TIME
TIME ISH A TOOL YOU CUN PUTCH UN DA VALL OR VEAR IT UN YUR WRIZT
He has an over the top German accent because Coocoo clock
He also screams COOCOO COOCOO COOCOO every 12 sentences and also repeats words when frustrated and such
EINS ZWEI DREI DREI DREI DREI DREI! DREI! DREI!
To spare him you have to turn back the clocks so that the Coocoo bird goes back in the clock
Shorter description today but enjoy
Holy fuck y'all need to support this man!
ITS SHOWTIME!
made a concept sketch of a poster for my chapter 3 take, maybe when my drawing pad is fix I can make a better quality Version of this.
anyways ya, I know there are a bunch of characters here I haven’t introduced yet to y’all, but hey think of it as a little teaser I guess.
anyways if you guys want me to make another poster for my take on chapter 4, or hell even five, then let me know.
Secret Boss 5....Right?
Another common trope for fan made Deltarune Secret Bosses is a corrupted Ice-E boss so here's Sl-Ice-E
An old animatronic for Ice-E pizza who use to serve pizza and smiles until a strange (kinda purplish black) man (strange guy really) approached and tampered with him
And he acted out and ate a child and got cancelled
He now what's be free of this alter ego
I saw this cool theory about Jevil representing ADHD and Spamton representing Autism so he represents DID having a disturbing alter ego inside his code
He uses pizza cutter blades as weapons and roller skates with pizza cutter wheels
He randomly adds hyphens into sentences because it's kinda funny yo
If you haven't gathered he's very FNAF but slightly colder
Secret Boss 4....?
Seems everyone is making western show themed cowboy chapter 3 secret bosses
Someone should explain that to me in the comments but I know it has something to with Friend In Me
Is that a string of text in the code or a hint Toby Fox dropped? IDK
But I'm throwing my hat in the ring I guess
So here's Sheriff St⭐rry
He's the sheriff with a pull string and spinny head
He has the pink and yellow eye things and inside his belt is his little friend
Because of his pull string he randomly blurts out 20 different unique phrases and also he replaces A with ⭐ unless it's one of his aforementioned phrases
One thing people don't seem to realize is that Jevil and Spamton don't touch the ground in their respective fights (and I mean the actual secret fights) so this lil guy kicks his feet to stay afloat. He used to be the irl sheriff and lead actor of Starry's Roundup until he arrested a mysterious man accused of an unknown crime. He tried to talk to the man and something....strang happened....the man and the sheriff disappeared without a trace....seems the man told him of his inevitable replacement both in the show and as a sheriff...but that's show biz for ya...he was replaced by a younger techno sheriff.....
Something else happened to him it seems something he tried to hide all his life is trying to break free...his dark side....the feelings he repressed....and when he you repress your feelings for too long.....they tend to want to break free....
Oh and he uses blue soul cause Papyrus
They need to invent life that doesn't suck
they need to invent shaving that doesnt suck
Secret Boss 3
Meet E. Vile
A chapter 3 secret boss based on stereotypical villains
He's based on Papyrus and a wind-up robot and is a theater performer. However the script wrote him as a villain and so that's all he'll ever be. He wants to be free to right the script his way
He makes you collect pieces for his machine and he achieves his second form
In his second form he starts to embrace being the villain
If he's gonna be made out to be the villain then he may as well be the greatest villain there's ever been
His speech quirk is that he speaks as if it's a script so he says his name before all his lines and announces all his actions like most villains
E. VILE: LADIES AND GENTLEMEN
BOYS AND GIRLS OF ALL AGES
ALL YOU GENDERS IN BETWEEN
YOUR HOST WITH THE MOST...
(DRAMATIC PAUSE)
IS DEAD!
NOW PRESENTING THE STELLAR
(RAISES AN OCTAVE)
STUPENDOUS
SUPERB
(RAISES TWO OCTAVES)
DR. E. VILE!
A ROUND OF APPLAUSE
(CLAPS HEARD IN THE DISTANCE)
IVE DECIDED THAT IF THE SCRIPTS ARE GONNA WRITE ME AS THE VILLAIN
(DRAMATIC PAUSE)
THEN IM GONNA BE THE BEST VILLAIN I CAN BE!
ARE YOU READY FOR THE GREATEST PERFORMANCE SINCE *CENSORED*!
BECAUSE IT'LL BE YOUR LAST!
THE STAGE IS SET
ITS THE FINAL ACT
AND WERE GOING OUT WITH A BANG
(PULLS OUT AN OBVIOUSLY MALICIOUS REMOTE)
FOR IF MY PERFORMANCE ENDS THEN EVERYONE'S WILL
MUAHAHAHAHA
NOW I WRITE THE SCRIPTS AND YOU DEAR KRISTINE ARE CAST WITH THE ROLE OF THE LIFETIME!
(PAUSE)
MY NEMESIS!
NOW PLAY THE MUSIC
(BOSS MUSIC PLAYS)
LIGHT THE LIGHTS
(STAGE LIGHTS BLARE)
ALL THE WORLD'S A STAGE!
(SING SONGY VOICE)
AND IM JUST PLAYING MY PART
*The Great E. Vile: Attack: EVIL Defense: EVIL. Certainly not forgettable*
*Machines whir in the background*
*Steam rises to your face*
*The air crackles with freedom*
o
/|\
/ \
They've been cut to pieces
9 +_o
Trying to banish a ghost
----
Run over flat
o/ <- person waving
o7 <- person saluting
ol <- person raising hand
o1 <- person scratching head
\o> <- person stretching
Secret Boss Day 2
Flowery
One of Asgore's Flowers that was thrown out who asks you to collect the other 6 so he can achieve his true form. He becomes a giant TV Omega Flowey monster but unfortunately he's bound to ceiling and wants to be free.
He's a former kids show host clown but after meeting a strange man he claimed he was split into 7 pieces and needed to find the other 6 and ran away
He replaces letters with numbers
Likes tormenting Kris especially on the genocide route
KR15! L00K H0W B16 4ND 5TR0N6! JU5T L1K3 45R13L! R3M3MB3R WH3N Y0U TW0 U53D T0 W4TCH M3 3V3RY N16HT? W3LL WH3R3 I5 H3 N0W? H3'5 G0N3. 4ND H3'5 N3V3R C0M1N6 B4CK. H3'LL M33T N3W FR13ND5 1N C0LL3G3 4ND F0RG3T 4B0UT Y0U..... believe me....I know...BUT B3S1D35...
WH0'D W4NT T0 B3 FR13ND5 W1TH 4 FR34K L1K3 Y0U!
It would be
And I'm not telling you where I live
So you'll just have to search everywhere with the same timezone
Also I will send this to my followers when I'm not trying to sleep
Which is like.... negative now
Firstly, when you get this, you have to answer with 5 things you like about yourself, publicly. Then send this ask to 10 of your favourite followers. (not forced ofc)
Oh wow! Ok. I'm done
Nothing like listing my favorite qualities at 11:40
My humor. I like to think I'm a pretty funny guy in a lovable asshole kinda way. I also like making funny inspirational quotes for my friends like "Is the glass half empty or half full? I drink the glass now it's empty and my bladders full", "Teach a man to light a fire and he's warm for a day light a man on fire and you get charged with criminal arson", and "What doesn't kill you only delays the inevitable and probably traumatizes you"
My chillness. I'm a pretty chill and accepting dude. As long as you're not a genuine dickhead I'll get along with you and I also really don't care too much what people think about me
My SMURTNESS! I'm a pretty smart guy according to most people. And it makes me feel good. I always try hard in school but I'd say I'm a dumbass when it comes to actual logic which I'm fine with because it makes me cuter
My weirdness. Once asked my friends what would happen if I stuck my dick in a vacuum cleaner! True story! I like to think I'm an anomaly in every regard and I'm fine with it. I talk to myself because I believe I'm the best person to converse with. I'm a pineapple out of pear on the Autism scale
My charm. I tend to win over a lot of people on accident. For some reason people like me and I don't even need to try. What can I say I'm just an amazing riz machine 😎. And if some people don't like that they can cry about it! *Dabs*
Firstly, when you get this, you have to answer with 5 things you like about yourself, publicly. Then send this ask to 10 of your favourite followers. (not forced ofc)
Oh wow! Ok. I'm done
Nothing like listing my favorite qualities at 11:40
My humor. I like to think I'm a pretty funny guy in a lovable asshole kinda way. I also like making funny inspirational quotes for my friends like "Is the glass half empty or half full? I drink the glass now it's empty and my bladders full", "Teach a man to light a fire and he's warm for a day light a man on fire and you get charged with criminal arson", and "What doesn't kill you only delays the inevitable and probably traumatizes you"
My chillness. I'm a pretty chill and accepting dude. As long as you're not a genuine dickhead I'll get along with you and I also really don't care too much what people think about me
My SMURTNESS! I'm a pretty smart guy according to most people. And it makes me feel good. I always try hard in school but I'd say I'm a dumbass when it comes to actual logic which I'm fine with because it makes me cuter
My weirdness. Once asked my friends what would happen if I stuck my dick in a vacuum cleaner! True story! I like to think I'm an anomaly in every regard and I'm fine with it. I talk to myself because I believe I'm the best person to converse with. I'm a pineapple out of pear on the Autism scale
My charm. I tend to win over a lot of people on accident. For some reason people like me and I don't even need to try. What can I say I'm just an amazing riz machine 😎. And if some people don't like that they can cry about it! *Dabs*
guess so
Now I'm concerned that we might be close to each other
Also how'd you reblog this so quickly?
I just fucking posted this?!?
Firstly, when you get this, you have to answer with 5 things you like about yourself, publicly. Then send this ask to 10 of your favourite followers. (not forced ofc)
Oh wow! Ok. I'm done
Nothing like listing my favorite qualities at 11:40
My humor. I like to think I'm a pretty funny guy in a lovable asshole kinda way. I also like making funny inspirational quotes for my friends like "Is the glass half empty or half full? I drink the glass now it's empty and my bladders full", "Teach a man to light a fire and he's warm for a day light a man on fire and you get charged with criminal arson", and "What doesn't kill you only delays the inevitable and probably traumatizes you"
My chillness. I'm a pretty chill and accepting dude. As long as you're not a genuine dickhead I'll get along with you and I also really don't care too much what people think about me
My SMURTNESS! I'm a pretty smart guy according to most people. And it makes me feel good. I always try hard in school but I'd say I'm a dumbass when it comes to actual logic which I'm fine with because it makes me cuter
My weirdness. Once asked my friends what would happen if I stuck my dick in a vacuum cleaner! True story! I like to think I'm an anomaly in every regard and I'm fine with it. I talk to myself because I believe I'm the best person to converse with. I'm a pineapple out of pear on the Autism scale
My charm. I tend to win over a lot of people on accident. For some reason people like me and I don't even need to try. What can I say I'm just an amazing riz machine 😎. And if some people don't like that they can cry about it! *Dabs*
Firstly, when you get this, you have to answer with 5 things you like about yourself, publicly. Then send this ask to 10 of your favourite followers. (not forced ofc)
Oh wow! Ok. I'm done
Nothing like listing my favorite qualities at 11:40
My humor. I like to think I'm a pretty funny guy in a lovable asshole kinda way. I also like making funny inspirational quotes for my friends like "Is the glass half empty or half full? I drink the glass now it's empty and my bladders full", "Teach a man to light a fire and he's warm for a day light a man on fire and you get charged with criminal arson", and "What doesn't kill you only delays the inevitable and probably traumatizes you"
My chillness. I'm a pretty chill and accepting dude. As long as you're not a genuine dickhead I'll get along with you and I also really don't care too much what people think about me
My SMURTNESS! I'm a pretty smart guy according to most people. And it makes me feel good. I always try hard in school but I'd say I'm a dumbass when it comes to actual logic which I'm fine with because it makes me cuter
My weirdness. Once asked my friends what would happen if I stuck my dick in a vacuum cleaner! True story! I like to think I'm an anomaly in every regard and I'm fine with it. I talk to myself because I believe I'm the best person to converse with. I'm a pineapple out of pear on the Autism scale
My charm. I tend to win over a lot of people on accident. For some reason people like me and I don't even need to try. What can I say I'm just an amazing riz machine 😎. And if some people don't like that they can cry about it! *Dabs*
Firstly, when you get this, you have to answer with 5 things you like about yourself, publicly. Then send this ask to 10 of your favourite followers. (not forced ofc)
Oh wow! Ok. I'm done
Nothing like listing my favorite qualities at 11:40
My humor. I like to think I'm a pretty funny guy in a lovable asshole kinda way. I also like making funny inspirational quotes for my friends like "Is the glass half empty or half full? I drink the glass now it's empty and my bladders full", "Teach a man to light a fire and he's warm for a day light a man on fire and you get charged with criminal arson", and "What doesn't kill you only delays the inevitable and probably traumatizes you"
My chillness. I'm a pretty chill and accepting dude. As long as you're not a genuine dickhead I'll get along with you and I also really don't care too much what people think about me
My SMURTNESS! I'm a pretty smart guy according to most people. And it makes me feel good. I always try hard in school but I'd say I'm a dumbass when it comes to actual logic which I'm fine with because it makes me cuter
My weirdness. Once asked my friends what would happen if I stuck my dick in a vacuum cleaner! True story! I like to think I'm an anomaly in every regard and I'm fine with it. I talk to myself because I believe I'm the best person to converse with. I'm a pineapple out of pear on the Autism scale
My charm. I tend to win over a lot of people on accident. For some reason people like me and I don't even need to try. What can I say I'm just an amazing riz machine 😎. And if some people don't like that they can cry about it! *Dabs*
Secret Bosses
Heya I'm deciding to do a thing for secret bosses until Chapter 3 (hopefully chapter 3 doesn't release for a while) I'll try and show off a secret boss every day
Feel free to give me ideas and requests
And because of this format don't expect all of them to have a lot of details because some days I might not have time for that
Count Von Thrill!
A boss based on Micheal Jackson's Thriller (this was drawn in October btw)
He was a former musician who made a deal with the devil to be the top of the charts. So his fellow musicians banished him to hell. But now that he's back he's ready for one final grand tour and all he needs is a Lightner soul to stay in this realm and top the charts once again!
lDARKNESS FALLS ACROSS THE LAND
THE MIDNIGHT HOUR IS CLOSE AT HAND
CREATURES CRAWL IN SEARCH OF S O U L
TO TERRORIZE YALLS HOUSEHOLDS
AND WHOSOEVER SHALL BE FOUND?
BUT THAT WITH A SOUL TO PIERCE THE GROUND
YOU STAND AGAINST THE GATES OF HELL
TO BE FREE OF YOUR CORPSES SHELL
A SULPHURIC SMELL HANGS IN THE AIR
AND A DEMON DESCENDS TO BRING DESPAIR
AND GRISLY GHOULS CRAWL FROM THEIR TOMBS
TO COME TO SEAL YOUR DOOM
THOUGH YOU FIGHT TO STAY ALIVE YOUR SPINE FEELS A CERTAIN CHILL
FOR NO MERE MORTAL CAN SURVIVE
THE DEMON OF
COUNT VON THRILL!
Also he's based on Asriel and has hidden demon wings
i don't give out shitty "take one"
Also I realized I hadn't posted in a while
Trick or treat!
Treat!
Here's some drawings as a treat
Spamton and Jevil clothing swap! Jevil's suits too tight, his glasses impair his vision, and he's naked from the waist down. Meanwhile Spamton can't see, his clothes are too big, and those shoes hurt his stub feet.
Spamton and Jevil as Sans and Papyrus. Spamton is Papyrus and Jevil is sans. Need I say more?
Doodles of Swap Lancers and Vampliance (like appliance and vampire). Just cause he's an NPC don't mean he's still not goofy. There's also She-Lance, Bandana Lance, and Jeff.
New secret boss concept art. A Mr. Rodgers/Welcome Home kinda dude. Is the boss the Muppet or his sock? Who knows! Cause he's still in development
More secret boss concepts. An x ray machine and a goofy ass clown. Idk. They're just concepts
A look inside my psyche via my math notes art. Top is my secret boss oc (forgot to reveal him) Creatos dressed as Balloon Boy (spoilers for an art piece I'm working on). Purple Guy and Springtrap but....bad. My secret boss oc and my friends; "Autism Boobs!" "Whyre you like this?". My other friends secret boss oc dressed as Jason. Another secret boss I'm working on dressed as Frankenstein. And a weird dude telling you to kill a snail.
More note doodles. Kris being impaled by BIG ASS KNIFE. Jevil and Spamton attacking anyone who misgenders Kris. Sans wearing an "I ❤️ Goat Moms" after leaving Toriel's bedroom....
Art of myself in my Halloween costume (I was the funny skrunkly Spamton). With the school version of the outfit in the corner. And Crocs since I wore those the first time I wore this and the second time I wore Hey Dudes.
And lastly predictions for the main bosses of chapters 3-6. The Rook (also known as Mike, Teevee, and Tenna) for the TV dark world in kris's TV. Bishop for a religious dark world in the church. Knight (not the real one but rather a fake out) for a book themed dark world in the librarby. And a Pawn boss for a dark world in kris and asirels room for after Asriel returns from college (they're a species rather than one person)
Ok that's a lot
Hope you like
Now I'm tired
Go home
Trick or treat!
Treat!
Here's some drawings as a treat
Spamton and Jevil clothing swap! Jevil's suits too tight, his glasses impair his vision, and he's naked from the waist down. Meanwhile Spamton can't see, his clothes are too big, and those shoes hurt his stub feet.
Spamton and Jevil as Sans and Papyrus. Spamton is Papyrus and Jevil is sans. Need I say more?
Doodles of Swap Lancers and Vampliance (like appliance and vampire). Just cause he's an NPC don't mean he's still not goofy. There's also She-Lance, Bandana Lance, and Jeff.
New secret boss concept art. A Mr. Rodgers/Welcome Home kinda dude. Is the boss the Muppet or his sock? Who knows! Cause he's still in development
More secret boss concepts. An x ray machine and a goofy ass clown. Idk. They're just concepts
A look inside my psyche via my math notes art. Top is my secret boss oc (forgot to reveal him) Creatos dressed as Balloon Boy (spoilers for an art piece I'm working on). Purple Guy and Springtrap but....bad. My secret boss oc and my friends; "Autism Boobs!" "Whyre you like this?". My other friends secret boss oc dressed as Jason. Another secret boss I'm working on dressed as Frankenstein. And a weird dude telling you to kill a snail.
More note doodles. Kris being impaled by BIG ASS KNIFE. Jevil and Spamton attacking anyone who misgenders Kris. Sans wearing an "I ❤️ Goat Moms" after leaving Toriel's bedroom....
Art of myself in my Halloween costume (I was the funny skrunkly Spamton). With the school version of the outfit in the corner. And Crocs since I wore those the first time I wore this and the second time I wore Hey Dudes.
And lastly predictions for the main bosses of chapters 3-6. The Rook (also known as Mike, Teevee, and Tenna) for the TV dark world in kris's TV. Bishop for a religious dark world in the church. Knight (not the real one but rather a fake out) for a book themed dark world in the librarby. And a Pawn boss for a dark world in kris and asirels room for after Asriel returns from college (they're a species rather than one person)
Ok that's a lot
Hope you like
Now I'm tired
Go home
K [A N G E L] & AME, AME
Idea from @cheyandyukisystem to dress Spamton as Kangel and Jevil as Ame
I don't know the characters but I but way too much thought in the designs
The streamers are spamton's strings and the ponytails are jevil's hat
Perfection
I should've thought to make Halloween costumes for the skrunkles earlier
If you have suggestions for more outfits for them give me them
This will be a thing next October for sure
A Different Undertale: Main Cast Summary
Content warning:
Frisk: Climbed Mount Ebott when playing with their friends. Fell and got amnesia. Actually takes the name of the first fallen human because of this. Goofy and childish. Naive. Easily manipulated because of their amnesia and general nativity and gullibility.
Flowey: If a monster body can't handle determination how would a lowly flower be able to? That's the logic I went with here. The determination and continued resets take a toll on Flowey's body. Due to his constant suffering he views the world through a pessimistic lense. More like a travel buddy for Frisk, constantly manipulating them to their bidding. Doesn't actually want to harm anyone, especially not Frisk, as they feel genuinely grateful for their help, but steal the souls to try and stop or at least delay his own demise.
Toriel: After being banished to the Ruins she lost all hope and began to deteriorate mentally. Delusional and has blotchy memories. Still kind and gentle but keeps mistaking you for her children. Doesn't remember who killed her kids but knew it was someone she loved and trusted. Somehow she begins to believe you killed her children and that's why you want to leave so soon. Similar to Horrortale and Underfell Toriel.
Sans: His magic became too strong and due to a combination of over exertion, low stats, laziness, drug addiction, and his loss of hope, his body began to deteriorate. He's basically a walking body made of dust puppeted by his soul. The only thing giving him a reason to live is taking care of his brother. Using magic, including shortcuts, causes him great pain. Smokes and drinks. Buys drugs off Grillby. Similar to Underfell Sans. Eye glows....grey. One hit is all it takes to shatter him completely. In genocide he doesn't even need to dodge as he's basically just dust now meaning your attacks have no effect.
Papyrus: Suffers from extreme autism and ADHD. Has little control over his body and magic. Still an expert with puzzles but they're more of his pastime. Needs constant attention and stimulation. Sans usually keeps him on a child leash to make sure he's not mugged or shanked or something. However most monsters actually really like him and most gangs even help him. A shining hope in the underground, showing there is good out there. Similar to Horrortale and Axetale Papyrus. Almost completely mute only speaking in jumbled words and an occasional NYEH. Sans translates what he means to the best of his ability.
Undyne: The cruel captain of the Royal Guard. Ashamed of the person she's become which is why she rarely removes her helmet. Sent to execute innocents and usually follows through. Refuses to kill children or queer people (as long as being queer is their only "crime") so she "accidently" lets them get away. The only person who can access Alphys. Secretly lesbian but won't come out due to fear of being removed from the Royal Guard.....or worse. Stays in the Royal Guard only because she's afraid of someone worse taking over. Still hates humanity but comes around pretty easily. If anything were to happen to her friends she might just finally snap.
Alphys: A "criminal" due to possessing human objects, being bisexual, and also illegal experimentation (honestly that's the only real crime here). Ashamed of herself. Isolated and hidden in her lab which has high security designed to only allow humans and or Undyne. Due to her isolation she has terrible eyesight. "Sees" by sensing Infrared heat like snakes. Nervously shakes ALOT. Has a lisp and a stutter and just generally has trouble talking. Has a huge crush on Undyne but doesn't want to get her in trouble.
Asgore: Has a genuine hatred for humanity after they sealed his kind underground and cursed them suffering. A cruel leader who hates anything the humans made. Doesn't even burry the humans just stores their corpses in his corpse room to intimidate the next humans. Doesn't even want freedom. Just likes killing humans. There's a small bit of his original kind and gentle self in there. Similar to Underfell Asgore. Cold. Destroys the Mercy and Fight buttons. Forcing you to just stall.
Mettaton: He was able to avoid execution for being so....Mettaton by promising to "bring hope and happiness to the underground." In other words....he's a sex worker. Hotland has become one big strip club. Many monsters hate him because he avoided execution by offering over his body. He's viewed as a cheater and able to be free. But really he's just as trapped as everyone else. Forced to stay in his ex form 90% of the time and has come to hate it. He's also come to hate Alphys for ditching him. He's become almost as pessimistic as Napstablook now. He buys drugs from Muffet to cope but they don't really have an effect besides gunking up his machinery. His body was also made more sexually appealing and even more feminine. All of his dreams of acting have been taken away and replaced with an eternity of dancing poles. He's similar to Lusttale Mettaton and Angel Dust from Hazbin Hotel
Napstablook: After his cousin left their dying snail farm Napstablook turned to drugs. They smuggled them from Grillby's as they didn't want to be seen but at least they always left money on the counter on their way out. Unfortunately the drugs dont do anything for Napstablook because they're a ghost and the drugs are corporeal. If they would've asked for ghost drugs Grillby probably would've asked Muffet to make them since who would pass up an opportunity for a whole new group of customers but Napstablook doesn't like to talk to people and prefers isolation. They are also suicidal and similar to most Horrortale Napstablook interepretations they make a noose with their tears which is what they're doing when you first meet them. Unfortunately since their a ghost they can never truly rest in peace.
Monster Kid: Hangs around with other gangs who are a bad influence on the child. They're violent and aggressive. They still admire Undyne (though they pretend not to, to seem cool) and get under her skin and she comes close to killing them a couple times. They actually do die in the neutral and genocide routes. In neutral they fall off the bridge before anyone can save them and in genocide they are killed before Undyne can arrive. They are incredibly petty and jealous towards those with arms which is almost everyone.
Temmies: Tem has taken advantage of her intelligence. She runs a cultist gang of Temmies worshipping the all knowing egg. She keeps the loyal by manipulating them and getting them high on Grillby's drugs. She believes herself to be too smart for college and just wants all the money for the hell of it. Sends her Temmie hordes on heists and has them donate their riches to the egg's donation box which just so happens to lead to Tem's underground weapons shop. She sells great weapons at high prices and is a pretty influential terrorist of the underground. The only Tem she hasn't converted yet is Bob. He sits in the corner of the abandoned Tem Village (they relocated to a new area known as Tem Empire or Tempire) and thinks about how far he let things get out of hand....and if he should just follow everyone else.
Grillby: A drugs dealer in Snowdin. One of the kinder monster though. He's greedy and will kill anyone who pisses him off. But won't go out of his way to hurt anyone and at the end of the day he's just trying to provide for his family. He doesn't make drugs just sells them though sometimes he spices them up with fire magic. He's well liked in Snowdin....too well liked as he's afraid someone's gonna let slip about his underground operation. He makes sure to butter the dogs up with treats in his "apartment" and let them play poker. Misses his daughter but was forced to move away to Snowdin when Muffet threatened not to supply him with anymore products if he didn't move further away from her shop.
Muffet: Money isn't the root of all evil. It's people's greed that makes them evil. And none are more evil than Little Miss Muffet. Little Miss Muffet sat on her tuffet making her joint and weed. When along came cops who told her to stop but they're just food for her pet to eat. She makes all the drugs in the underground and sells them to other vendors only asking for a third of the revenue. She may sound like a great boss. But if you don't pay her in time you'll find yourself on the wrong side of her web. She already helped save the spiders from the Ruins due to her immense influence. She just wants the money to fill her putrid black heart. She may be cruel but deep down she's really just a scared little girl. Trying to prove herself to adults and not get pushed around. The only people who truly understand her are her spiders.
Mad Mew Mew: She's already transitioned due to her dummy body being destroyed in a fit of rage from Undyne and her finding this body dumped in the trash by the guards who raided Alphys human junk. Shes content with this body. But the underground doesn't take to lightly to queer folks. Asgore thinks it's something the humans made up and thus must be evil. And so Mew Mew is considered a criminal just for being herself. But if she's gonna be a criminal she might as well own it. She's gonna be the Undergrounds greatest criminal. Cause if she's going down she's taking all these other motherfuckers down with her. She leads a gang of other oppressed people and commits small misdemeanors and attacks those rude guards. Always being careful to avoid capture. She's one of the top crooks on Undyne's radar. And yet Undyne can't bring herself to capture and execute her. Undyne understands her struggles but doesn't agree with how she goes about dealing with them. They fight on the battlefield but in secret they hang out. They have a frenemy relationship. Undyne is trying to convince Mew to join the guard to at least offer her some protection but she's decided on raining hell in the Underground just to see the look on the guards face when they realize they messed with the wrong trans kitty.
River Person: Hope can be found in the strangest of places. River Person has gone quiet. Communicating through actions rather than words. Ferrying those who are worthy and drowning those who aren't. They drown very few people though. They try to see the good or rather potential for good in everyone. They believe there is hope for this world. That people can and will change. And that one day very soon peace will be returned. Until then they'll just hum their little tune in their riverboat and pray for a better tomorrow.
Annoying Dog: God has left this world
Asriel: Hopes and Dreams are a thing of the past. Asriel was born in a world with no Hopes, no Dreams, no Love. They befriended Chara but were distant from the rest of their family. They helped Chara move in their wheelchair and wanted to believe humanity was good....but one day disaster struck. Asriel and Chara were picking flowers. Chara knew very little about flowers and made a pie with them for Asriel's 12th birthday.....and poisoned him. The buttercups they picked poisoned the young monster and he passed away soon after.... As Flowey he blames Chara for everything. For the way the underground is. For the way he is. And for giving him hope that humanity was capable of anything but cruelty. He hates humans he hates monsters and wants them all to burn in hell alongside him. Even after regaining his true form he's covered in melting scars like a decaying corpse. Because some wounds never heal.
Chara: The first human who fell. They climbed Mount Ebott to bring joy to Monsterkind but ended up falling and breaking countless bones. They became wheelchair bound but Asriel and Toriel cared for them. They loved flowers and baking but weren't good at recognizing flowers. This lead to Asriel's death. Chara was stricken with grief and blamed them self which may be why they didn't fight back when Asgore killed them. It's said that when you enter the King's throne room you can still hear their laughter.
Gaster: His fall into the Core was no accident. He saw the decent of Monsterkind. And didn't want to around long enough to see it. So he fell into the Core. However even in death monsters are doomed to suffer. As he didn't die. He's stuck watching the world he tried to help spiral into hell unable to help. In intense pain his new goal is finding a way to put this world out of its misery.