Yoshi is a green dinosaur from the Mushroom Kingdom. He wears orange shoes with yellow bottoms. His hands, body, tail, and head are all a light shade of green. His chest and mouth area are white in color, though. Although he has never been seen without shoes, Yoshi's appearance in Super Mario RPG: Legend of Seven Stars as well as the feet of the Yoshi Sphinx in Paper Mario Sticker Star confirms that Yoshi has three clawed toes on each foot and padded feet. Along with his head having orange spikes. He has a red shell that has a white rim on his back. Some of his powers include flying and devouring enemies with his long tongue.
Yoshi's first game in 3 additional colors (light blue, pink, and yellow) is in the multiplayer mode of Mario Kart: Super Circuit.
Several years down the road, Yoshi is now available in 8 more colors (as long as you bought the DLC pack), black, red, pink, yellow, white, blue, light blue, orange, and then you can also choose just the standard green. (Marking him as one of the two only characters to be playable in various colors; the other character being Shy Guy.)