Don't use rape/abuse or parent murder. That stuff is so overused in the development of neutoric or disturbed that it is rather ridiculous. Perhaps someone who lost something dear to them that they held in high regard. Something that they obsessed over until it slowly ate away at their mind, until all that was left was a burning desire of sorts to take from those who this character believed had stolen from them. In other words, a person who decides to solve their own sense of emptiness by bringing that same feeling to others.
Just something that came to mind. Its probably not a good idea. >_<
Just something that came to mind. Its probably not a good idea. >_<