The Gunslinger is a male character who appears in the later episodes of the series, first showing up as a reinforcement outside a castle. He is known by the nickname Gunslinger who never lands a hit, a title that reflects his unusual and non-lethal combat style.

His background reveals that he was hired by a character named Tsutsumi in a Wild West town, as shown in one of her flashbacks. His distinctive outfit is that of a classic cowboy gunslinger. In terms of personality, he demonstrates a creative and artistic side, possessing a talent for singing and playing the guitar, as seen when he performs a song about cats.

The Gunslinger's primary motivation is to fight against the cat horde that has overrun the world. He utilizes a unique and unorthodox weapon for this purpose: two pink powder sprinkler guns that fire catnip powder. This weapon is designed to put attacking cats to sleep rather than to kill them, which explains his nickname and suggests a more pacifistic or pragmatic approach to dealing with the feline threat.

In the story, he is first seen operating alongside the Last Samurai, another character who appears in the series' opening sequence. Together with Tsutsumi and a few other survivors, he is forced to retreat after being overrun by cats, eventually arriving at a fortified location known as the Citadel. He and the Last Samurai are later shown leading a resistance against a group of cats.

Regarding his key relationships, the Gunslinger has a direct connection to Tsutsumi, who originally hired him. He also works in close cooperation with the Last Samurai as a fellow fighter and ally. Furthermore, he has a specific cat archnemesis named Diamond Claw, indicating a personal stake or recurring conflict within the larger war against the felines.

Information about his development throughout the series is limited. His notable abilities include his marksmanship with his unique catnip-firing guns and his previously mentioned musical talent.