Venom Movie: Who Is Riot?

With Sony releasing the new Venom trailer, we got to see that this upcoming movie contains a lot more symbiotes than we originally expected. Venom aside, Scream, Riot, and possibly Phage appear in the trailer. However, it was mentioned at Comic-Con that Riot will be a bigger part of this movie. Who is this character, and where does he come from?The symbiote that would eventually be known as Riot made his first appearance in Venom: Lethal Protector #4 back in 1993. Using Venom, Dr. Carlton Drake