Gnaw

Though he originated as just another Sharkticon, Gnaw seems to be loyal only to the one who fed him last, be they Quintesson, Decepticon, or even Autobot. Much like his kin, he is insatiable in appetite and savage in combat. Gnaw's "masters" don't so much give him orders as they do unleash him like a caged tornado that promptly eats its way through the battlefield in a feeding frenzy.

And yet, Gnaw has on occasion shown glimpses of heart and devotion. He has been known to watch over the Autobot Wheelie and seems genuinely loyal to the youngster regardless of suppertime frequency. Gnaw tends to snap at the fingers of any other robot, however.

He uses a "Maceration Laser" rifle and has a mace.

He transforms into a large walking shark.