All the main characters in the trilogy had some sort of psychological problem/issue (except Gordon and Rachel)
Ra'as al ghul - superiority complex/sociopath
Crane- well, y'know, some sorta sicko who enjoys scaring people
Two-face - trauma of getting his body burned and losing the woman he loved made him insane
Bane - also superiority complex and sociopathic tendencies
Batman - loss of his parents drove him to becoming a costumed vigilante.
Ra'as al ghul - superiority complex/sociopath
Crane- well, y'know, some sorta sicko who enjoys scaring people
Two-face - trauma of getting his body burned and losing the woman he loved made him insane
Bane - also superiority complex and sociopathic tendencies
Batman - loss of his parents drove him to becoming a costumed vigilante.