Big Foot

From Sonic - Wiki on Neoseeker

Spider-Troop Big Foot was a G.U.N. mech. Unlike most G.U.N. hardware it was operated by a human pilot, which turned out to be a downside as the cockpit was a weak point. Big Foot was armed with a machine gun mounted on its nose and rocket launchers on its shoulders. The rockets could only be fired while the mech was grounded, while the machine gun could be deployed in flight.

Sonic fought the Big Foot while attempting to escape from G.U.N. in Sonic Adventure 2.

Big Foot's design was adapted into two variants, Hot Shot and Flying Dog. Two mass-produced models had been commissioned by the time of Shadow the Hedgehog, by which time the mechs were capable of walking.