Half the roster is clones of Yoshi
Psh, that's baby talk. Allow me to fix this.
All characters on the roster are clones of Yoshi, that each act like the characters he replaced.
Pichu Yoshi hurts himself.
Snake Yoshi's eggs explode.
Roy Yoshi is just Yoshi but on fire.
Daisy Yoshi is Melee Yoshi
Young Link is Baby Yoshi
Toon Link is Yarn Yoshi.
Jigglypuff Yoshi is the Red Yoshi from NSMBU.
Greninja Yoshi is the Blue Yoshi from NSMBU.
Ridley Yoshi is just Yoshi, but he's super violent.
Kirby Yoshi can copy other fighters neutral Bs with Egg Lay.
Bayonetta Yoshi is just Yoshi but with a gun.
Shulk Yoshi has Baby Mario Arts. Which are just Monado arts but with Baby Mario instead of the Monado.
Ice Climbers Yoshi is just the cyan and Pink Yoshi as a tag team.
Pokémon Trainer Yoshi is just a tiny Yoshi, a regular Yoshi, and a big Yoshi.
Dark Pit Yoshi is Boshi.
Yoshi Yoshi is so Yoshi that you can't even handle the sheer amount of Yoshi that is.
And so on, and so forth.
Thus we have: Super Yoshi Bros. Island.