Flame Stag

Flame Stag, known in Japan as Flame Stagger (フレイム・スタッガー Fureimu Sutaggā), is a Reploid in the Mega Man X series based off a deer. Once serving as a member of the Maverick Hunters 17th Elite Unit, he defected along with his colleague Boomer Kuwanger to join Sigma's first Maverick rebellion. Afterwards, his whereabouts became unknown, but later he resurfaced occupying an active volcano with the intent of triggering an eruption that would block out the sun with volcanic ash, starting a new ice age.