After seeing Venom in the Ultimate Spider-Man series, the charater does look ultimate as most characters go. The only thing different about Venom in this series is that instead of being Eddie Brock, it's Harry Osborn which is one key reason the series would be somewhat different from the the comics and other Spider-man shows. Still if Venom can survive in his third episode appearance of the Ultimate series, there are chances that we can finally see the one villain that Marvel never included in western animation for a decade
CARNAGE!
Carnage will eventually appear in the series and it will hopefully be the psychopath Cletus Kasady that bods with the symbiote and certainly not anyone else. Fans were hoping to see Carnage in the Spectacular Spider-Man series but all because of the bastard Greg Weisman, who had no freaking excuse to cancel the third season over such lack of planing, lack of power, and lack of understanding what fans want instead of acting like a group theripist of voice actors like Peter Macnicol and Vanessa Marshall. Because of Weisman cancelling season 3, many fans had to waste three years of waiting for the new Ultimate Spider-man series to premire. Hopefully, the show will have Cletus Kasady be ready to appear as Carnage sometime later in season 1 of the Ultimate Spider-Man!
Count on it!