Assist Trophy

When an Assist Trophy is picked up, it will summon a character that will help the summoner.

Returning
Italics mean that their function has been modified.
 * Akira
 * Alucard
 * Andross
 * Arcade Bunny
 * Ashley
 * Black Knight
 * Burrowing Snagret
 * Chef Kawasaki
 * Dillon
 * Excitebikes
 * Ghosts
 * Gray Fox
 * Guile
 * Jeff
 * Kapp'n
 * Kat & Ana
 * Krystal
 * Lyn
 * Metroid
 * Midna
 * Moon
 * Mother Brain
 * Phosphora
 * Rathalos
 * Riki
 * Rodin
 * Sable Prince
 * Saki Amamiya
 * Samurai Goroh
 * Sheriff
 * Shovel Knight
 * Starfy
 * Sukapon
 * Tiki
 * Vince
 * Waluigi
 * Yuri Kozukata
 * Zero

New

 * AiAi (Super Monkey Ball)
 * Agnes (Bravely Default)
 * Amaterasu (Okami)
 * Ayumi Tachibana (Famicom Wars)
 * Azurda (Xenoblade Chronicles)
 * Birdo (Mario)
 * Cap'n Cuttlefish (Splatoon)
 * Chibi Robo (Chibi Robo)
 * Claus (EarthBound)
 * Colette Brunel (Tales of Symphonia)
 * Conker (Conker's Bad Fur Day)
 * Cranky Kong (Donkey Kong)
 * Deathborn (F-Zero)
 * Doc Loius (Punch-Out!!)
 * Fi (The Legend of Zelda)
 * Funky Kong (Donkey Kong)
 * Garet (Golden Sun)
 * Kamek (Yoshi's Island)
 * Lissa (Fire Emblem)
 * Mallow (Super Mario RPG)
 * Min Min (ARMS)
 * Professor Layton (Professor Layton)
 * Rabbids (Rabbids)
 * Shantae (Shantae)
 * Silver (Sonic the Hedgehog)
 * Sirius (Bomberman)
 * Space Invaders (Space Invaders)
 * Tom Nook (Animal Crossing)
 * Viridi (Kid Icarus)
 * Wingo (Mario)