"What’s an Assist Trophy?!
Well, these are characters who appear to aid the fighter that called them forth. Basically, they’re guest characters separate from Smash’s playable roster!
Super Smash Bros. Brawl is sort of like a festival that all sorts of characters show up for. Bear in mind, though, that you can’t control any of the characters appearing on these pages. Let there be no mistake about that.
In any case, you won’t know who is in an Assist Trophy until you use it."