My serious suggestions would be: Rayman, Klonoa, Zero (Mega Man X), Marina Liteyears, Bomberman (not an assist trophy), Neku (TWEWY), Amaterasu, Viewtiful Joe, Knuckles, Tails, Gene (God Hand), Banjo & Kazooie (unlikely now), Waluigi, Demise (LoZ:SS), Blaziken, Zoroark, Chibi Robo, Paper Mario, Simon Belmont, and some…