Catman

An ex hitman with a personal vendetta against the people who forced him to become one in the first place. He has taken it upon himself to bring the organization down, by eliminating those in power one at a time as well as ruining all their plans.

Doesn't mean he's 100% on the side of good though, he's still quite focused on his own agenda. He doesn't have a very good moral compass, and will kill anyone who gets in his way.