Kerberos

Kerberos (ケルベロス) is an one-wheeled Mechaniloid from Neo Arcadia's Scorched Earth Squadron that appears as an enemy in Mega Man Zero and Mega Man Zero 4. They attack by trying to run over ZeroXorZ. When defeated, they grind to a halt, turn transparent and explode. In the first game, they appear in the Destroy Train, Rescue Colbor and Duel in Desert missions, where Zero fights against the Pantheon Core, Harpuia, and Fefnir. In Mega Man Zero 4, they appear in Living City (Popla Cocapetri's stage) and the Prison where Zero fights Hell the Giant.