Yoshi

Yoshi is one of the main heroe

Canon Biography
Yoshi is Mario's longtime and faithful companion. He has helped Mario and Luigi fight against Bowser countless times in the past. He is introduced in episode 3, and is able to find a Chaos Emerald due to his powerful sense of smell. However, he was confronted and brutally defeated by Mecha Sonic, who took and escaped with the Emerald. Yoshi was nursed back to health by Mario and Peach in episode 4. He comes back to action in episode 5, and saves Mario from being killed by Thunderfoot and the Yoshi Tribe. He joined Mario, Luigi, Sonic and Shadow in the fight against the Koopa Bros, Axem Rangers X and Mecha Sonic.

Fanon Appearences
In EdGeorgenCody's SMBZ Episode 9, Yoshi plays a minor role, this also marks his first (and so far only) time speaking in a bubble, saying "Dr. Eggman? Reminds of the guy from the Pingas Videos" when Sonic tells Yoshi his backstory while Both of Them, plus Luigi, are in a coma, he starts a rivalry with Eggman in this episode, In the Koopaling Battle, He fights Bowser Jr. and Morton. He, along with Luigi, are left to fight King Boo and the Dry Bros. at the End of the episode.