Backstory: Basically a meaner, nastier Venom.

Cletus Kasady had a troubled upbringing: he killed his grandmother by shoving her down the stairs, and later his father killed his mother (as she tried to murder Cletus). Seemingly for the fun of it, Cletus then testified against his father to ensure he was sentenced to death.

Cletus (perhaps unsurprisingly) became a serial killer in later life and came into contact with the Venom symbiote whilst in prison. The monstrous form destabilises his personality even further, as he continues his killing spree.

If Ifans Played Him: He'd be a great physical match: as he's not big enough to convince as Venom, he'd be perfect Carnage (and psychotic, ginger-haired yokel Cletus).

Spidey-Sense Tingling? He is a fan favourite, and, much like Venom, he has the in-built appeal of basically being an evil Spider-Man. But the character's murderous rampages would probably have to be toned down considerably for the family-friendly franchise, which raises the question: why bother?

Key Scene(s): A series of flashbacks that gradually reveal Cletus' brutal upbringing.