1 Bowser Jr.
Bowser Jr., or sometimes simply Jr., is a video game character who appears in Nintendo's Mario franchise as the secondary antagonist. He is the youngest son of the series' primary antagonist, Bowser.
I think he'll be playable - Jake09
Come on with all the koopaling trying to stop you - dinosaur
3 Titan Devil
4 Claus / Masked Man
Genesect, known in Japan as the same name, is a Legendary Pokémon species in Nintendo and Game Freak's Pokémon franchise.
6 Dark Bowser
7 Man at Legs
Sans or Sans the Skeleton is a character in the 2015 RPG Undertale created by Toby Fox. He is a lazy, pun-loving skeleton who is a supporting protagonist in the "pacifist" and "neutral" routes of Undertale, and a heroic antagonist/final boss of the "genocide" route. He is known for his incredibly difficult ...read more.
10 Tails Doll
11 Metal Mario
This guy was the most annoying boss on N64. The only people who can beat him in under 30 seconds were Mario, Yoshi and Jigglypuff. He is a very hard boss to fight but also a fun one.
12 Ballos (Cave Story)
13 Giga Bowser
15 Wolf O' Donnell (Star Fox)
16 Masked Dedede
17 Evil Ash
At least a Pokemon Trainer will be in Smash as a boss.
Also known as Dark Bowser.
19 False Bowser (Super Mario 3D Land)
Rayquaza is a Legendary Pokémon species in Nintendo and Game Freak's Pokémon franchise. It lives in the ozone layer, and frequently stops battles with Kyogre and Groudon, two other Legendaries.
Zekrom, known in Japan as the same name, is a Legendary Pokémon species in Nintendo and Game Freak's Pokémon franchise.
22 Info-Chan (Yandere Simulator)
If Yandere ever makes it in, Info-Chan better be a boss.
23 Mephiles the Dark
24 Bark the Polar Bear
26 Sigma (Mega Man X)
27 Bass (Mega Man)
28 Petey Piranha