Mark Danielson, aka Powermaster, is a superhuman who partially mimics the abilities of his enemies after studying them for a short time. The source of this power is unknown. He was an antihero using villian powers, until he accidentally used Psychosurgeon's insanity inducement on himself, making him turn to super-crime. When he first appeared, he took away other heroes' foes as his own until he went insane.
He has a lot of powers, but also a lot of heroes to fight who I may or may not have added to this wiki yet.