The Wii Fit Trainer is a role in the Wii Fit series filled by a female or male fitness instructor.
Wii Fit Trainer - SmashWiki, the Super Smash Bros. wiki
Bowser Jr. (SSB4) - SmashWiki, the Super Smash Bros. wiki, mario bowser jr
Super Smash Bros. for Nintendo 3DS/Wii U - Bulbapedia, the community-driven Pokémon encyclopedia
Meta Knight - WiKirby: it's a wiki, about Kirby!
Villager - Super Mario Wiki, the Mario encyclopedia
Nabbit - Super Mario Wiki, the Mario encyclopedia
Wii Fit - Wikipedia
Super Smash Bros. - SmashWiki, the Super Smash Bros. wiki, smash
Wario Guide: Matchup Chart and Combos