There's also characters like Rosalina and Zelda, who essentially steal **** from the main character of the series to make their movesets. Most of the stuff we see Rosalina do she usually doesn't do in the Mario games(like shooting starbits or using launch stars), but since she's from Galaxy, and it has very unique Mechanics that Mario himself doesn't implement why not apply said mechanics to a side character who originates from the same game as said mechanics. Zelda doesn't ever use Din's Fire, but Link does, and he doesn't need it because dude's got more important staple weapons to pull from.
Any other characters that could/would work like that? Apply one and done moves/gimmicks?