Topgunder originally intended to kill Metalder in a one-on-one fight, later he gained respect for Metalder and became close allies with him. In Episode 33, a second Topgunder was created to bait Metalder into a rescue, as the real Topgunder had been captured by the armies of God Neros. The fake robot attacked Metalder shortly after being rescued, only to be shot and destroyed by the real Topgunder when Crosslander exposed the deception. Also, in Episode 33, Topgunder revealed that he, like Zargen, was capable of dreaming. He helped Metalder to bring down the Ghost Bank in Episodes 35-37, only to be killed by God Neros, who was in Coolgin's old armor.

Topgunder is armed with a built-in radar, a sniper rifle, uses a motorcycle, & has a reinforced left arm. Topgunder is a lone gunman in black tights and a single red-eye who believes in fair play.