Background behind this is I have a character, who (among other things) broke a car salesperson's nose because she was trying to sell his friend a Saturn, a brand which he's decided are connected to a 'brain control cult'. Also, she's a succubus.
Bearing in mind also that said character comes from a long line of demon hunters, so many of his delusions are, in fact, not delusions. Trouble being, most of them are.
What mental disorder might such behavior be classified as?