Ness, Link, and Yoshi.
I've seen a fair amount of pretty insane Yoshi and Link characters. Link has a good use of projectiles, I was never much of a Link player, and Yoshi is really fun to use, I don't main him, but I do like his fair, if used correctly, and you can pull off a few kills when an opponent thinks they can make a recovery. His egg use by the edge looks pretty good, but I haven't tried it myself. As for Ness, I don't know much about him, but I've seen him used and by pretty good people. Not very specific, but that's my thoughts.