Okay those are good, but really what smash needs is... ... ...
Rash / Zitz from the Battletoads series NES era
Reason:
From the beginning of Smash I thought one of the Battletoads characters would fit in perfectly. One of the iconic characters from the NES era of gaming, these comical fighting toads large boots, ram horns, and oversized fists would make for a solid addition to the roster and would undoubtably be a fan favorite. They are designed from head to frog foot to Smash! Such an addition would certainly be one of my go to fighters.
Of course it is probably unlikely due to Rare being owned by Microsoft, but the reality is that they were a large part of the NES era gaming and being in smash could bring them back into relevance. I would love to see them in smash!