Happy is a neutral Chao with light pink arms and feet, pink wings, a light blue torso and a yellow dot floating above their head. For attire, they wear an red-orange apple with black eyeholes and a green stern over their head.
In Sonic Adventure 2 and its remake Sonic Adventure 2: Battle, Happy is a level one beginner opponent in Chao Karate. In gameplay, Happy walk around slowly on the floor while fighting in Chao Karate. Their recommended status is 10.