Brooklyn 99 Set the bar too low

Corrin, Marth, Roy, Ike, and Robin
All FE XD

Samus, Steve, Ridley, Mii Gunner, Little Mac

Pac-Man, Lucario, Mii Brawler, Dr. Mario, Luigi, Wario, Sora, Pyra & Mythra, Sonic, and Jigglypuff

Cloud, Sephiroth, Sora, Shulk, there's not enough Square Enix-produced characters in SU, and IG Incineroar

right now, from memory

Mario
Donkey Kong
Samus
Yoshi
Star Fox
Captain Falcon
Dark Samus
Lucina
Marth
Ganandorf (i think that's how its spelled)
R.O.B
King Dedede
Meta Knight
Chrom
Sonic
Pikachu
Lucario
Mewtew? mewtwo? idk
Link
Zero Suit Samus
Inkling
King K Rool
Diddy Kong
Bowser
Bowser Jr (and koopalings)
Pac Man
Megaman
Steve
Ryu
Ken
Simon
Richter
Joker
Banjo Kazooie
Terry
Pyra and Mythra
Shulk
Pokémon Trainer
Pit
Dark Pit (for some reason)
Paulatena (idc how its spelled)
Snake
Robin
Corrin

Link and Mario.

Link, Young Link, Toon Link, Mario, Dr. Mario.

Ike, dark Samus, Ridley, cloud, daisy