Explanations will be down in comments below again, if you want.

Player: Mario or Steve

Veteran: King Dedede

Captain: Captain Falcon

The Gentleman: Marth

Mr. Cheese: Kirby

Mr. Egg: Yoshi

Mother: Rosalina & Luma

Stoner: Ridley or Charizard

BDay and Rose: Ice Climbers

Gnome: Daisy

Engineer: Dr. Mario

Angel: Pit

Ninja: Cloud

PoopyFarts96: Wario

Bro: Terry

Sheriff: Wolf

Goober: Wendy

Rookie: Link

Blue: Fox

Not-Orange: Joker

Greaser: Little Mac

Wizard: Robin

Happy: Pac-Man

Sir Clogsworth: Luigi

Hornsly: R.O.B.

Pirate: King K. Rool

Dum: Peach

Noob: Isabelle

Freezy: Lucas

Hunter: Snake

Flamingo: Pichu

Vinny: Falco

Baggy: Meta Knight

Impostor: Mii (Dressed as Player)