A high-performance Sonic robot which was created by Dr. Eggman. The first appearance of Metal Sonic was in Sonic CD. In order to compete with Sonic's speed, Metal Sonic is equipped with a powerful propulsion system, which allows Metal Sonic to accelerate quickly. There are no special attacks which effect his body.

The guardian angel of the Chaos Emerald. Chaos Zero was in Sonic Adventure. After being released from the ancient seal, Chaos Zero absorbed the Chaos Emeralds one by one and increased its size. Eventually, it completely destroyed a whole city. Its destructive impulse are toned down, but its special attack is still very powerful.

Dr. Eggman created the Dark Chao Walker for the mean Dark Chao. It doesn't move very fast, but its attack and defenses are strong enough to scare their opponents. One blow will kill you.