Easy.
1) Zero from megaman X. He has close range and long rage combat skills, he can't be infected, can't get tired...He's THE guy to have in a zombie invasion.
2) Shadow the Hedgehog, for teleporting, time slowing, flight, and his familiarity with weaponry.
3) Samus Aran. Also can't be infected (As long as she has the suit on), and like zero has infinite ammo. Plus, plasma beams could be super useful.
I think I can make it.