superprincess
Smash Ace
I think Yoshi should keep the egg symbol and count as his own universe in Smash. As someone who was introduced to Yoshi through the Mario games, it did seem a little weird at first that he's separate, but from an unbiased point of view it does make sense. Most Yoshi games don't even feature Mario, they're their own unique brand and Yoshi in Smash represents that. Wario is more of a clear case, as the WarioWare series has done pretty much everything to establish itself as a wholly different universe from the very beginning.
There's no point in arguing about this though, as both Yoshi and Wario are grouped with the Mario characters in the CSS of both Brawl and SSB4, proving that Nintendo/Bandai-Namco/Sora Ltd. clearly think of them as Mario sub-series. Which is true, they're unique series that spun off from Mario characters.
That does raise the question of why Luigi's Mansion isn't its own universe in Smash but... the games themselves still heavily feature Mario characters (Boos, Mario himself, and Peach and Toad as of LM3) and Luigi's Mansion content regularly finds its way back into the Mario brand: from haunted mansion tracks and Poltergust karts in Mario Kart, to E. Gadd in some early RPGs. WarioWare has never had that same bounce back into the Mario-verse, and neither does Yoshi tbh. Aside from the Yoshi's Island track and Poochy in Mario Kart Tour / 8 Deluxe, no Yoshi-original content has made its way into the Mario series to my knowledge.
And for the few people on GameFaqs (lol) that recommended Peach should count as her own series due to Showtime the answer is just no. That's one game with no connection to Peach's previous starring role (Super Princess Peach), meaning that there's no concrete "Princess Peach" series of games.
There's no point in arguing about this though, as both Yoshi and Wario are grouped with the Mario characters in the CSS of both Brawl and SSB4, proving that Nintendo/Bandai-Namco/Sora Ltd. clearly think of them as Mario sub-series. Which is true, they're unique series that spun off from Mario characters.
That does raise the question of why Luigi's Mansion isn't its own universe in Smash but... the games themselves still heavily feature Mario characters (Boos, Mario himself, and Peach and Toad as of LM3) and Luigi's Mansion content regularly finds its way back into the Mario brand: from haunted mansion tracks and Poltergust karts in Mario Kart, to E. Gadd in some early RPGs. WarioWare has never had that same bounce back into the Mario-verse, and neither does Yoshi tbh. Aside from the Yoshi's Island track and Poochy in Mario Kart Tour / 8 Deluxe, no Yoshi-original content has made its way into the Mario series to my knowledge.
And for the few people on GameFaqs (lol) that recommended Peach should count as her own series due to Showtime the answer is just no. That's one game with no connection to Peach's previous starring role (Super Princess Peach), meaning that there's no concrete "Princess Peach" series of games.