Kiseru is an anthropomorphized firearm categorized as a "Bizarre Gun" within the franchise. His design originates from a historical Edo-period Japanese smoking pipe modified into a single-shot firearm, combining kiseru pipe elements with a gun mechanism. This hybrid design places him in the distinct "weird-ass gun" classification alongside others like Cane and Cutlery.

In gameplay, he is a 2★ rarity character associated with the Red Rose attribute. His initial combat statistics include an attack value of 335, an evasion rating of 300, and an accuracy rating of 290. He is acquired via the Resistance Ticket Gacha system in the original mobile game. His representation centers on this conceptual origin as a hybrid antique firearm and his functional role within the game's mechanics.