His Bio, found in Facebook Game Wall Posts, reveals that his true identity is "Mac Gargan".
His Bio also refers to him as being formerly Scorpion, similar to his comics counterpart.
Venom symbiote was originally merged with Spider-Man as his Black Suit in the game.
In the comics, the Venom symbiote merged with Eddie Brock, the original Venom. Then later it was merged with Mac Gargan (Scorpion) after the story arc Siege, the symbiote was forcefully removed from Mac, and bonded to Flash Thompson as Agent Venom.
However, in-game the symbiote seperated and, both Mac Gargan and Flash Thompson are currently Venom