EggRobo is the robotic counterpart to Dr. Robotnik.
EggRobo was created in order to hinder Knuckles in Sonic & Knuckles. He has a small role as a badnik enemy in Sonic's storyline, but replaces Robotnik as the end-of-stage boss during the Knuckles storyline. Robotnik wanted to create a robot as a copy of himself in order to carry out his evil plans much more easily than before.
EggRobo entered the race with his master, Robotnik, in order to slow down and defeat Sonic and his friends in the Sonic R race. EggRobo is unlocked at Regal Ruin and is a slow character. He, like Robotnik, can shoot missiles at his enemies.
EggRobo looks relatively similar to Robotnik. He is painted the same colors as Robotnik's shirt and is round like an egg. Skinny limbs come off of its combined head-body, and he carries a gun that shoots missiles on enemy targets.
- His name may be a reference to Robotnik's Western and Eastern names, Eggman and Robotnik, combined.
- For Sonic R, he was renamed Eggmanrobo in the Japanese release of the game.