Mario. Dr. Mario. I feel adding him might upset the roster but I think he has the potential for one of the best movesets in the game. I feel he'd have a really great chance if Dr. M was not in the game. That said I'd love to see him but I can see where this one may not be the best choice as DLC. Maybe Smash 5. He is popular still so I can see both sides. I like Paper Mario and feel he'd be amazing