Metallo

John Corben/Metallo is a character from Justice League and is a minor antagonist in Knights of the Multiverse Season 2. He's a cyborg powered by a piece of Kryptonite that works with many other supervillains and criminals in the Secret Society, and was a part of those that joined up with the Glemy Faction in a bid to conquer the known Multiverse.

Pre-Series
John Corben was originally a top-tier mercenary that was offered a way to avoid death by Lex Luthor; transfer his mind into an indestructible android body made of metallo, possessing strength equal to Superman's and powered by a Kryptonite heart. His body was originally covered with a layer of artificial skin, but when he realized that he could no longer smell, eat or feel, he ripped away part of his artificial skin and officially adopted the identity "Metallo". He would go on to face the Man of Steel many more times.

Skills & Powers
Corben's body possesses incredible superhuman strength and durability, nearly as much as Superman. Moreover, because of his Kryptonite battery, he's virtually immortal. Said Kryptonite battery also allows him to project focused Kryptonite radiation and energy blasts from his chest and eyes.

The Knights
Metallo actually harbors a huge sense of jealously/hatred towards the android members of the Knights since they're apparently advanced enough to smell, eat and feel (though artificially) while he can't.