Andross,
Devil,
Dr. Wright,
Excite Bike,
Hammer Bro,
Helirin,
Jeff,
Jill,
Kat and Anna,
Knuckle Joe, (He has a lot of moves, even he has to borrow from Fighter Kirby)
Lakitu and Spinies,
Little Mac, (as seen in Smash 4)
Lyn, (While a fan favorite to a lot (I'm not one), I don't see what she could do that Marth/Roy can't. Educate me if you have an idea.)
Metroid,
Mr. Resetti,
Nintendog,
Saki Amamiya,
Samurai Goroh,
Starfy,
Tingle,
Waluigi, (You guys already know my opinions on him, and I regard him very highly. I will keep presenting my case until this battle is over.)
Barbara,
Gray Fox,
Infantry and Tanks,
Isaac, (Probably the most popular candidate for an assist trophy promotion. The Djinni he can use can vary his attacks greatly. I don't mind him being added, especially if he doesn't get into Smash 4.)
Ray Mk III,
Shadow (Not a Shadow fan, but he does have a diverse moveset, and some pretty good PSA's on brawlvault. IMO, i don't think Sonic (Metal gear as well) should get another representative because Smash Bros. is mainly Nintendo franchises with some third party. Sonic does his job of representing his franchise well enough, but if Sakurai adds a second Sonic (or Mega Man) character to Smash 4, I may have to alter my stance.)