Zero has pretty good range and awesome combos and he's a pretty quick Character being able to use his Sword, Buster, and other moves he learns in the X series. I think he could be a possible candidate for your team. Try training with the characters everyone suggested and then when you're ready either try them team out on Arcade on a hard difficulty level or go straight to online and see how everything fares off. :)
I personally love Zero ever since TvsC and bringing him to MvC3 was the best thing they could have ever done =].
I personally love Zero ever since TvsC and bringing him to MvC3 was the best thing they could have ever done =].