Eggrobo

Eggrobo (エッグロボ, Eggurobo) (originally spelled EggRobo in the manual) is an egg-shaped humanoid robot resembling Dr. Robotnik. It first appeared as an enemy in the game Sonic & Knuckles, but has since then appeared in several other main games and spin-offs.

In Super Smash Flash 2
Eggrobo appears in the background of the stage Sky Sanctuary Zone, flying from one side to the other in the background. He has no impact on the game otherwise.