He is a robot version of Spring Man, created by Dr. Coyle. His choice of ARMS are the Toaster, thr Boomerang, and the Tribolt. His backstory is:
"A lean, mean fighting machine designed and built by ARMS Labs! His metal body is inspired by the popular fighter Spring Man, and he's packed with the latest advances in fighting technology. With the goal of improving ARMS Labs's image by flexing their scientific muscle." He can disable arms if someone throws a punch at him and misses.