I'm writing about an insane character and I need tips. Here's some info: -He makes friends with his victims, then brutally and graphically kills them. -He's a sociopath and a psychopath -He has high charisma and is trusted by many -Nobody knows he's insane, not even his victims, as he wears a mask. -He became insane because a serial killer killed his family, and he instinctively used an old hatchet to behead the serial killer. The trauma, mixed with the suggestive events, caused his insanity.