Notes:

They were able to make Assist Trophy Bomberman's model (?, itself coming from Super Bomberman R?), and Minecraft's Pig and Creeper costumes clearly used detached limbs like Miis had had in Wii Sports and such, so why not another AT repurpose that also has detached limbs?

I resized the body (and maybe the head) to be a bit bigger to possibly fit the Mii body better, IDK if they're okay with the Mii body being that small, maybe similar resizing might be needed for the limb parts too for all we know.

I feel like this could be a really simple method of bringing us another cool "deluxe" Mii Costume (doing it with Rayman might invoke controversy…) and bring even more love to this Nintendo fighting game that predated Smash and might have helped inspire it a little: https://www.youtube.com/watch?v=qJqGTACh45g