I've Seen People Use This Scene For A Lot Of Interpretations But I Personally Always Saw It As Asriel

i've seen people use this scene for a lot of interpretations but i personally always saw it as asriel choosing to accept chara despite their flaws. he spent god knows how long clinging to what was essentially just a concept to try and comfort himself, making chara out to be an ideal best friend who was always right about practically everything and whose presence could've solved everything when that wasn't the case. chara was a traumatized and clearly unwell child, just like how asriel is now, definitely not someone to be placed on a pedestal and imitated. even during their lifetime, chara was likely idolized by other monsters aside from asriel if asgore's whole "you are the future of humans and monsters" paired with the prophecy is anything is anything to go by, and that likely fed into their mindset which lead to their plan with the buttercups.

asriel may wish that frisk was his best friend, knowing that likely things would've turned out better if they were there instead of chara. it wouldn't be wrong for asriel to be disdainful and unforgiving of chara, similarly to how you can choose to neither forgive nor comfort asriel. you aren't painted as a bad person for it as asriel *did* hurt people, even if a lot of that was erased via resets. even during the game he can outright kill asgore before your eyes, and likely kills frisk multiple times on the average playthrough as well. similarly, regardless of what chara's intentions were, they were the one that led asriel to his death via pressuring him into following their plan, even if they did have pure intentions.

but in the end, despite all of that, chara was asriel's best friend and he's accepted that, even if they weren't the ideal he considered them to be. he chooses to spend his final moments as what he considers to be himself at the side of his best friend and sibling, seeing them for who they truly are this time. a hurt and extremely troubled child who was unable to cope, like him.