Metallo(Earth-16)

John Corben, aka Metallo, is a antagonist in Nightwing: Shadows of the Past, Present and Future and member of the Crime League.

Metallo is a criminal who operated out of Metropolis in taking down Superman.

History
At some point, Metallo was created by a professor called Emmet Vale to kill Superman. He killed Emmet Vale and was abducted by Lex Luthor who upgraded him to operate as an agent of The Light. At one point he battled against Supergirl and lost.

Sometime after The Reach was defeated on Earth, Metallo was approached by Ninja Master and offered a deal he couldn't refuse. He ended up being the muscle of the Crime League and was present when the Court of Owls was defeated.