Mario, Luigi, Dr. Mario, and Wario should all be on the same roster icon because they all have huge noses, wear overalls, have bright colored hats, use their hands and feet to fight, and what have you. If they look similar and use similar weapons to fight, I don't see why it should matter. They're all the same, you know?
Peach, Daisy, Rosalina, and Zelda should all be costumes of one another because they're all princesses. Sure, Rosalina has a Luma, but she's just so similar to Peach. That long dress...those blonde-ish locks of beautiful hair...they just look...so...SIMILAR.
Ridley should be put into the rotation of Pokemon Trainer as a swap out for Charizard, because they're both dragons. I mean, sure, you say Ridley is in space and Charizard can have various personalities. But they're both DRAGONS. They could easily fit over one another.
Sheik should just be a Greninja costume because they're clearly so similar to each other. Uh, hello??? THEY'RE BOTH NINJAS! Why bother giving them that extra slot if they are basically the same thing, know what I'm saying?
King K. Rool should be a Bowser costume. They're both reptilian ogrelords who have nothing better to do than annoy their rivals. There isn't really THAT MUCH that separates them.
Ness, Lucas, and Villager should all just be costumes for each other because they're basically small children in shape and size. There are only a few ways small children can fight, and they can all do it!
Fox, Falco, and Wolf should just be costumes because they all shoot guns and are furries. Get these weird humanoid animals out of here.
Ok, I'm done being a turd, lol. (Ironically added Star Fox after initially posting and saying "K I'm done" lmao)