Paint the Town Red
Carnage was once a serial killer known as Cletus Kasady, and became Carnage after merging with the offspring of the alien symbiote called Venom during a prison breakout. The symbiote amplified his psychotic nature making him even less mentally stable than he had been previously, and therefore even more dangerous. An interesting note is that, unlike Venom, Carnage is a singular entity, referring to himself as “I” instead of “We”, because the symbiote has actually merged into Kasady’s bloodstream. Carnage is also the “father” of Toxin. A note on his childhood: Cletus’ father killed his wife (Cletus’ mother) because she tried to kill Cletus. Cletus then testified in court against him, saying that he killed her for no reason, causing him to die by electric chair as means of punishment.
It is also unclear on Cletus’ relationship with his mother, as he seems to have feelings for her, causing him to dig up her grave at the end of his massacre through New York. He also revealed that he killed his grandmother when he was younger, pushing her down a flight of stairs. Since the alien symbiote adapts to the host’s personality, the Carnage symbiote is affected by Kasady’s insane mind and lust for destruction.