Genders and Appearances:
Mitsumarutchi has a round body. He is red and has three black circles which are on his tummy, resembling buttons. He has a yellow face and a pink beak, round black ears on top of his head, and short stick-like arms and legs.
On Virtual Pets
"Mitsu" (三つ) is a Japanese word used with counter words. (For example, 三つ角 mitsukado means "three corners") and "maru" means "circle". In Mitsumarutchi's case, his name means "three circles", describing the buttons on his tummy.