Mummified Hedgehog

The Mummified Hedgehog resides in the Pyramid of Robotnikhotep located in Mobigypt. He is more than likely an ancestor of Sonic the Hedgehog due to them having extremely similar personalities and appearances. He could also possibly be the grandfather of Masonic who built the Pyramid of Robotnikhotep. His name is never mentioned.

The Mummified Hedgehog wears a necklace with an emerald around his neck, which allows him to activate a blue shield which can make him immune to the powers of anyone wearing the Chaos Emerald of Immortality. He lets Sonic borrow the emerald so he can defeat Dr. Robotnik, who took the chaos emerald of immortality from Robotnikhotep. After Robotnik was beaten, Sonic returned the emerald and the mummified Hedgehog went back in his coffin.

The Mummified Hedgehog is the archenemy of Robotnikhotep. They seem to have a relationship very similar to that of Sonic and Dr. Robotnik.