Mental disordered peolpe and peolpe with dissability becoming very attractive to us, especially for movies. Let me give some examples about the best seller movies in the world with psychological disordered person :
Beautifull mind, about John Nash who got skitzoprenia, but he also very intelligent and a nobel prize winner.
Adrian monk (fiction character), a man with obsessive compulsive disorder, but that makes him easily recognize if anything goes wrong and it makes him a great detective.
Haniball Lecter, a brilliant character, genius but got serius problem with his cannibalism caused by a traumaric experience watching soldiers eat his sister.
Those are just small examples, if you like to see the rest of the movie follow this link: