Most evil: an ENTP with an axe to grind or suicidal tendencies.
An ENTP with nothing to lose? Or isn't afraid of losing it all...? Sounds about right. Like a bomb.
But seriously... I'm sticking with my assessment of ESFJ. They have no internal, moral code - and can be persuaded that anything and everything is good based on their surroundings. They're manipulative as hell, and people believe them! EVIL!!!! >.<
Practice random kindness and senseless acts of beauty.