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What would she say to the people who knew he was a senti? Would she say that she knowingly broke the rings and she killed him?
How would Natalie, someone who parented Adrien, and was ready to become his guardian react?
How would Felix, whose whole thing is to protect sentibeings and trusted Ladybug with vital information about him and Adrien, showing her where both of their Amoks are, react?
How would Kagami react?
What about Adrien's grandparents?
Would Ladybug explain that the Grand De Vanily daughter used a broken miraculous that slowly killed her? (Of course, there's a chance they already know that). Would she say that the Grassets son was a terrorist because of Emelies death? Would ladybug say that their grandson they've just met got killed by her?
What about Adrien's friends?
Would she tell them she killed their friend, Adrien was a sentibeing, and didn't warn him about who he was before it was too late?
How would Alya, who knows who Ladybug is under the mask, react to that?
How would Luka, who knows who both Ladybug and Chat noir are, react?
What about Nino, whose best friend died?
What about the public?
She has no excuse to lie about Monarch anymore because her main motivation was to "protect" Adrien, but now her main reason for lying is gone, so would she just reveal everything about Monarch then? Would she continue to lie because of.. reasons?
Adrien is a very liked person and celebrity, so if the people found out Ladybug both called Monarch a hero and killed Adrien Agreste, they would NOT be a fan of Ladybug anymore.
What about Plagg?
Adrien being gone would also mean Chat noir is gone, so would Plagg tell Marinette that Adrien was Chat Noir, or would he lie and tell her "he quit"? Who would be the next chat noir? He can't choose Kitty Noir, because choosing any of the miraculers would risk the new holders' identity.
Of course, there's Bunnix that would probably help because, well, Adrien's Chat Noir, but what if he wasn't Chat Noir? Would bunnix still help Ladybug? I mean, having Adrien gone isn't really a world ending event, and even if many people get Akumatized, the miraculers could still fight them.
Ladybug killing Adrien Agreste would honestly just ruin the crap out of Ladybug's reputation and not be a physical world ending event, so would Bunnix really need to help?
What if the bunny miraculous didn't exist? What would happen then???
Anyway, I hope someone makes a fanfic about this, because there were, and ARE, a risk in Adrien not knowing he's a senti.