Complete Carnage (Mirage)

Complete Carnage is a demon-type guy who can turn himself into any form. His origin story describes that he started out as a regular human construction worker. One day while he was fixing a cement wall, he was struck by lightning. This mutated him and turned him evil. The same lightning bolt also hit a girl jogging in Central Park. She became "Radical" and represents ultimate good. He represents ultimate evil. They became arch-enemies.

He has the power to move steel and concrete and absorb energy from said things. He can also walk through steel and concrete. Upon his first appearance in Tales of TMNT Vol 1 #5, it is mentioned that he used to be called "Carnage" but now due to his true understanding of his powers, he refers to himself as "Complete Carnage." He reappears in Tales of the TMNT Vol 2 #41.