[Arkham]

I like Psychoanalysis for the 2nd power name as suggested by Bats.

Perhaps have whatever the bonus ends up being only apply to the individuals he's generally associated with? Investigators, Slashers, and possibly a 3rd? Criminals, Psychopaths, or Lawmen...? That way he has a more distinct synergy to fall into, and generally opens up a better bonus opportunity if you limit those benefiting from it.