Carnage

Cleetus Kasady was a severely mentally unstable serial killer who briefly shared a cell with Eddie Brock. When Eddie broke out, he left a part of his Symbiote behind, and  Carnage  was born. Using the abilities of his new symbiote, Cleetus created a long history of slaughtering people and being put in jail for it.

Many of his adventures involved Venom and Spider-Man, whom he believed to be his mortal enemies. During one such stint in the Raft, a mass breakout occurred, and Carnage was flown into orbit and ripped in half by the Sentry, seemingly being killed. Years later, in an attempt to recover Kasady's symbiote, his body was captured, and he was found to be alive. Given cybernetic implants for legs, Cleetus eventually recovered his symbiote as well and remains at large.

The name "Carnage" may also refer to the Carnage Symbiote, the spawn of the Venom Symbiote, which bonded to Kasady while he was serving eleven life sentences in prison.

Because symbiotes do not exclusively bond to one being, a number of people have worn the symbiote over the years, taking along with it the name "Carnage". These hosts can be found in the Others section. The Alternate versions listed below are those of Cleetus Kasady.

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History

 * But isn't that what you want to hear, doctor? That I was a poor, abused child? That my mother beat me? My fathermolested me? That I was tortured and hung by ankles over a pit of broken glass? Well, maybe that's all true. Or, maybe... I'm just the inevitable aberration. The soul that's born so black, so twisted, so filled with unreasoning hatred... that there's no explanation. You can't make me sane, doctor. You can't hope to redeem me. All you can do is kill me. Because, if you don't-- I'll break out of here. You have my word on that. And the blood-- the glorious blood-- will flow like  wine!  
 * --  Carnage  src