One of my favorite City of Heroes characters, Krieghart. Against most enemy groups, this guy was nearly unstoppable. This is one of those characters who made great use of the difficulty-tweaking options, because I really needed more enemies. He was a Brute archetype, so with each hit he landed and each hit he took, his damage would increase. By the time his Fury bar got full, he could one-shot regular foes with his best single target attack. Plus, he had one of the most entertaining multi-target attacks ever. It was called Crowd Control, and it involved swinging his mace low through a group of enemies. Basically, anyone in melee range in a 180 degree arc in front of him would take lots of damage and get knocked down. If I used it on a nice big group of low level guys, I could recreate that scene from the beginning of the Fellowship of the Ring movie where Sauron was successfully taking on an entire army by himself.