I want to say Yoshi, I really do.
Only problem is that Yoshi doesn't really have anything on Dedede but a Chaingrab (Irony), but nothing to follow it up on like Snake, MetaKnight, or Falco. He destroys Snake now, but it was only discovered recently (Like today recently), But I don't think it was thought of when this hint was made. Are these hint's Live by the way Samurai?
But I honestly don't know who else it could be. It could be Pit, but he used to be very popular. Peach also, but I don't know her Matchup's or AT's.....