Weirdly enough I have a character sort of like that that was also ****ed up in the head at one point. Her name is Remilia. She starts out ****ed up because no one liked her due to her psychic powers, and went completely bonkers when she couldn't 'see' you. (She merits existence on emotion, and you're blocked from her powers.)
When she's beaten, she tries to get over that, though people still hate her with the exception of the other members of the Elite 4 (And she finds that out just after she's beaten, too, which is probably the reason she doesn't want to kill you after that.) (And the 8th gym leader, but he doesn't hate anyone except one of the Evil Team Admins). By the time she gets kidnapped in the second game, she's not nearly as crazy.
... Though that doesn't mean she doesn't measure existence through her emotion sensing. She tries not to, but... she can't get over it. She is a bit shy when she's out of insano mode, but... it's better then what she was before.
If you stopped making horrifically borked up characters, I'd be worried. I'm more in to firey characters that are out to prove themselves to the world.
Emi, for instance, lost both of her legs in a car accident and is only able to walk thanks to prostetics, but because people stare (which she hates horribly) she always trys harder than everbody else at physical activities, she's also got quite an outgoing personality, although she hates the fact that she has no legs she's lucky to be alive and is grateful for that fact.
I just keep making horrible, horrible people. And this one is just an ******* just cause. Also he looks like an adorable little girl, too, thanks to being turned into a monster by his son, who thought he was getting back at his father, but turns out...