Hei Hou/Pre-SGW

Hei Hou is an axe wielding Badnik created by Dr. Ivo Robotnik.

Fight in Mushroom Hill
Hei Hou encountered Sonic the Hedgehog and Miles "Tails" Prower in Mushroom Hill Zone where it swung its axe at Sonic, who managed to avoid the surprise attack. Sonic managed to avoid another swing and attacked it from behind, finishing off the robot for good. It was later either rebuilt or duplicated by Archimedes and sent to attack Knuckles the Echidna during an early lesson that the enigmatic Fire Ant sought to teach his pupil. (SaK; STT)

Background Information

 * Hei Hou was based on the sub-boss of the same name in the Sega Genesis video game, Sonic the Hedgehog 3 & Knuckles. It was unnamed in the comic, but is considered tier 2 canon by this site's canon policy, as it does not contradict already established canon from tier 1.