Tattooed Man

Mark Richards went missing when his helicopter exploded and was presumed dead. He turned up later on in Gotham City.

The Tattooed Man joined Deathstroke's Villains for Hire to avenge the death of his son at the hands of Slipknot. He was part of the group that caused the death of the first Atom, and is haunted by the fact. Although a supervillain (currently), he's often shown a desire to 'do the right thing' when the chips are down. Like his teammate, Cinder, the victims who he killed tended to be 'evil' people.