The most common and main color variant of the Yoshis, introduced in Super Mario World. He is the default and most iconic look of the Yoshi species.
He is the best friend and steadfast ally of Mario with an incredibly friendly, cute and carefree personality.
In the Mario franchise, especially the spinoffs, the Green Yoshi is more likely to be treated as a specific unique individual character rather than a generic member of the Yoshi species.
