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A character concept that I'm actually surprised I haven't seen more, now that I think about it:
A character with a tragic past who's beautiful in an unthreatening, pitiful sort of way, who goes "wait hold on, people think I'm cute?" and immediately goes drunk with power. Having a whole villain arc getting corrupted by the power of being just so tragic and pathetic that people can't be mad at them. Someone who's been accustomed to always being the one who's blamed and punished no matter whose fault the problem was suddenly discovering that actually they could get away with murder by being so big-eyed and sad.
And once they figure out that they can just Poor Little Meow Meow their way out of anything, they do. Going from being genuinely skittish and timid into pretending to do so merely as an act, manipulating the shit out of everyone and avoiding all suspicion because Look How Sad And Wet And Pathetic I Am, of course they couldn't do any harm to anyone ever.
And if one person finally does see right through that act and puts puzzle pieces together of how there's been just too many suspicious coincidences and accidents that only one person would actually benefit from, they confront the Tragic Little Act directly, one-to-one, to say "I'm fucking onto you and your shit"
And suddenly they completely snap out of their timid, pathetic presentation to give a big, wide, sickening smile like "no-one's ever going to believe you."