While we're (vaguely) talking about the [_____] Wars series, I'm surprised these guys have never really been talked about:
In Captain Rainbow there's the "Famicom Wars Soldiers" that represent the basic infantry unit for the Wars games, and they strike me as the sort of character that would strike Sakurai's fancy (not unlike Pokemon Trainer, Mr. Game and Watch, Wii Fit Trainer to an extent) to represent the series. A single "Famicom Soldier" or something that can call in little tanks, choppers, and so forth for backup seems very "Smash Bros." to me.
The same "realistic guns" ban that Snake had might effect them, but it'd be no less avoidable here. Or they could just make the weapons super cartoony.