Since they're only doing Nintendo characters, I don't think Bomberman would work as I'm pretty sure that's appeared on different consoles. K. Rool would be a good one to put in, as would Meta Knight and Wario. As far as Pokemon go, there are WAY too many of them already, but I'm sure there'd be more. I say more Earthbound characters, personally. It'd be interesting if Sonic and Shadow made it in as well.