@Cyringohn:
Seeing as how firearms aren't allowed, I don't really see what Master Chief could do. You could make him run around and throw grenades, but then he's basically just a copy of Snake.
But laser weapons are still allowed, right? I mean alot of character has unconventional scifi stuff. I hope nobody doesn't take this seriously but I would imagine something like this (just for fun, come on):
Special: Needler
Up Special: Plasma Sword
Down Special: Gravity Hammer
Forward Special: Plasma Granade
Final Smash: Spartan Laser
He would use similar style of fighting as that Spartan did in DoA, expect with some sword moves mixed in. And Guilty Spark, Arbiter and Cortana would make cameos as Assist Trophies.
Anyhow . Leon Kennedy would be an awesome pick! And that would even make sense. I haven't even thought about him before. Now, how to make him to fight without firearms though? Without making him a Snake rip off? I'm sure they could figured it out. Or they have, if it's true, that it. I'm starting to hope it is.