'Venom' might have been something of a critical disappointment, but it also just broke the record for best domestic box office for an opening weekend in October, so at least one or two sequels are all but guaranteed. Sony was either psychic or overly optimistic, because they had the foresight to include post-credit scenes, one of which set up Cletus Kasady, a serial killer played by Woody Harrelson, who in the comics becomes the supervillain Carnage.
To further cement the kind of threat Kasady could pose, Sony displayed a prop journal at New York Comic Con belonging to 'Venom' protagonist and investigative reporter Eddie Brock, which outlines the mass murderer's various crimes and psychoses.
Stand-outs include an Oedipus complex so severe it caused him to dig up his mother's grave, the slaughter of 11 inmates at Rikers Island, and the murder of his own grandmother.
This is fairly reflective of the comics, where Kasady is an unrepentant psychotic killer who bonds with a fragment of the Venom symbiote to become Carnage. He's a dangerous and sadistic butcher who often uses his powers in creatively vicious ways. Brock's assessment that for Kasady, "unpatterned bloodshed = the ultimate freedom," is very correct.
Carnage is known to be so powerful, Venom had to team up with longtime foe Spider-Man. While it is highly unlikely that the wall-crawler will make an appearance in the proposed sequel, it might be an opportunity to bring in some of the other 900 or so Marvel characters Sony owns the film rights to, such as Morbius the Living Vampire, Man-Wolf, Silk, Miles Morales, Ghost-Spider, or Agent Venom.