Even without the absence of the Mii costume, can we just stick on why exactly people still think Geno is totally impossible? Good lord, just look at this game:
-Every single character that's ever been playable in the series.
-Three characters that Sakurai previously said weren't going to happen anytime soon (Daisy, Ridley, and Chrom)
-Inceniroar when everyone and their grandma insisted it was going to be Decidueye before Vergeben came along
-Richter... just Richter. There was literally no reason to use the resources to make this character aside from pleasing Castlevania fans but they did it anyways.
-Dark Samus was a character that hadn't had a major appearance in 11 years and yet another character they didn't need to add outside of fan service.
-A character that's only Nintendo appearance was a Sonic the Hedgehog costume before he was picked for DLC (Joker)
-A character that hadn't had a notable Nintendo appearance in almost 20 years (K. Rool)
-Not one but FOUR characters from arguably the most legally convoluted franchise in all of gaming (Hero). Oh, did I forget to mention that this is LITERALLY THE FIRST TIME THE CHARACTERS HAVE BEEN ALLOWED TO APPEAR SIDE BY SIDE IN THE FRANCHISE'S ENTIRE 33 YEAR HISTORY merely because Sakurai wanted it to happen?
-A common enemy (Piranha Plant)
-A character of a direct competitor of Nintendo that hasn't had a game on a Nintendo platform in almost 15 years (Banjo)
So... that basically just leaves Inkling and Isabelle that were "safe" bets, Ken (yet another character they didn't have any reason to add outside of fan service to Street Fighter fans because god knows he wasn't topping any polls) and Simon. You have characters that were cut and gone for multiple games, literally turned down by Sakurai himself, absent from gaming in notable ways for a decade or even longer, owned by as many as four separate IP holders, are a minor, nameless enemy in their respective franchise, owned by Nintendo's competition, and had one minor cameo on a Nintendo platform before getting picked and yet, for whatever reason, Geno's this wonder-child of impossibility because of *checks notes* a PNG and Square Enix having 2 DLC characters is a big no-no-ah-boo-boo according to literally no-one?