Mighty the Armadillo is a Mobian eastern armadillo who took up residence in the mountains of Angel Island, though he was born planet-side in the Kingdom of Mercia. He has known Sonic the Hedgehog since his childhood, though after their first adventure together they did not meet again for roughly six years. After spending much of his youth wandering, he was brought to the Angel Island by Knuckles the Echidna and Vector the Crocodile. One of the original members of the Chaotix, Mighty has fought by their side in numerous battles, and would often back up Sonic's old team, the Knothole Freedom Fighters. His adventures eventually led to being reunited with his long-lost sister, Matilda the Armadillo, long after both their parents had died.

Has no cannon voice.