Baby Mario

Appearing first in Yoshis Island (Super Mario World 2), Baby Mario is a baby version of Mario. So far, he has appeared in many Mario spin-offs, but most notible is the Mario & Luigi: Partners in Time game where he apperead as a playable character, and a main character. He will also be staring in the upcomming game Yoshi's Island 2 for the Nintendo DS.

SNES

 * Super Mario World 2: Yoshi's Island

N64

 * Mario Tennis
 * Mario Golf

Gameboy Color

 * Mario Tennis GBC
 * Mario Golf GBC

Nintendo DS

 * Yoshi Touch & Go
 * Mario & Luigi: Partners in Time
 * Yoshi's Island 2