Yoshis appear in many Mario games, staring with Super Mario World. After that, they appear in almost every game, including Mario Kart, Mario Party, and of course, Super Mario 64. Yoshis do not appear in real life, only in videogames.
Kaze is a well reknown fan of Yoshis, having many stuffed versions in his room. There is usally a yoshi in one of the corners in Kaze's Twitch Streams. In fact, if you subscribe to his stream, you join the Yoshi Gang.
Yoshi is a playable character in SM64O, and appears in many Kaze games.