Kerberos

Kerberos (ケルベロス) is an one-wheeled machine 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 Zero. When they die, they grind to a halt, turn transparent and explode. In the first game, they appear in the missions that Zero fights against Harpuia, Fefnir, and the Pantheon Core. In Mega Man Zero 4, they appear in Popla Cocapetri's stage and the Prison where Zero fights Hell the Giant.