Yoshi

Yoshi (sometimes specified as Green Yoshi) is a dinosaur-like character that acts as an ally of Mario and Luigi, and the protagonist of his own franchise. He is the most recurring member of the Yoshi species and has aided his brethren in saving their homeland on multiple occasions. According to the Super Mario World manual, he got his name from Yoshi's Island because he was first discovered there. In his youth, Yoshi managed to rescue and protect Baby Mario and Baby Luigi from the wrath of Kamek and the Koopa Troop. In the Super Mario series, he often acts as a rideable character for the heroes, while in most of the spin-offs, he is a playable character on his own.

History
Yoshi makes his debut in Super Mario World, along with other Yoshi. Bowser magically encases some of the Yoshis in Yoshi Eggs. These eggs are then given to the Koopalings to be watched over. When Yoshi sets off to rescue them, he is also trapped in an egg, which is hidden in a block in a field on Yoshi's Island.

Luigi
Yoshi and Luigi are really good friends where Luigi and Yoshi hang out when yoshi play games together with Luigi.

Toad
Yoshi and Toad hang out each other by playing sports, racing and party games.