I agree 100%. Small references to the wider Nintendo world are fine like the King of games t-shirt and the N-Zap weapons, but Splatoon is great cause it stands on it's own as one of the few decent new Nintendo franchises in recent history. Just inserting things like Mario and Zelda into the game would cheapen it a little, I feel.Emphatically no; keep Splatoon Splatoon.
mario is in the audience in a kirby boss fight, i think, and peach's crown is a treasure in pikmin, although that is what we call cameos.Nah his isn' super Smash Bros where its a mash up of alot of stuff. You don't really see Mario jumping into Pikmin, Metroid, Kirby, Pokemon, and etc games.
Splatoon is Splatoon.
This i would be pretty fine with a shirt that has Mushroom from Mario or a Triforce.Cameos? Yes
Full on Mario/Zelda outfits? Nah.