I'll do ya one better and give a little description of what they could do, haha.
1) Orbulon (WarioWare): Flies his ship around the stage, typically in close proximity to areas where there are multiple fighters. If his ship is hit, he crashes, causing a large explosion.
2) Eggplant Wizard (Kid Icarus): Shoots projectiles that turn opponents into eggplants with legs. Easy to dodge, but being turned into an eggplant leaves you helpless to do anything other than jump and get pummeled.
3) Nightmare (Metroid): screws with the gravity, either making characters lighter or heavier. This effect stays until his Assist Trophy is over, or he is defeated.
4) Mallo (Pushmo): A Pushmo puzzle appears, and Mallo tries to solve it in the background. The Pushmo creates new platforms, and if a fighter stands in the way of a platform being pulled out, it hurts them and sends them flying.
5) Phoenix Wright (Ace Attorney): Yells "OBJECTION!" and rants about court stuff. His text boxes act likes Mr. Resetti's used to, and the initial "OBJECTION!" does a lot of damage, if the text bubble hits someone.
6) Goombella (Paper Mario): Uses Tattle on an opponent, telling her summoner all about the stats, background, and weaknesses of the opponent she honed in on. Basically a Codec.
7) Chibi-Robo (Chibi-Robo): Marches around the stage, cleaning the ground with his trusty Drake Redcrest toothbrush. Players who walk over the area he's cleaned trip.
8) Poochy (Yoshi's Island): Is basically Gogoat from Smash 4.
9) Urbosa (The Legend of Zelda): Shows up, snaps her fingers, zaps all opponents with Urbosa's Fury, strikes a pose.
10) Zip (Flingsmash): Bounces uncontrollably around the boundaries of the stage, pummeling any opponents in his way.