Six years before the main events, Kaburagi discovered Pipe trapped within Gadoll flesh on the fortress walls and rescued it. Unlike other Gadoll, Pipe shows no violent tendencies. Kaburagi secretly kept the creature as a pet, caring for it while hiding its existence.

Pipe has a pale beige body and six legs ending in salmon pink. It possesses large eyes with light red pupils and blue-and-white ringed irises. Its compact form resembles a beluga whale compressed into a pug-like shape, featuring tardigrade-like legs.

Natsume accidentally found Pipe at Kaburagi's residence. As Kaburagi hadn't named it, Natsume called it "Pipe" after it presented her with a pipe, formalizing its identity.

Pipe displays a gentle, timid nature, bonding closely with those who show it kindness. When petted or content, it releases small steam puffs from an opening atop its head. This steam-release ability is otherwise only seen in Gadoll Alpha. Pipe's non-aggression marks it as an anomaly among Gadoll, possibly an aberrant developmental stage.

Its primary bonds are with Kaburagi, its caretaker, and Natsume, its companion. Minato, Kaburagi's acquaintance, also knows about Pipe and helps monitor it, indicating awareness beyond the core duo. Pipe serves as a narrative symbol challenging assumptions that all Gadoll are hostile.

Pipe's existence concludes during the series' events. Its death occurs without direct impact on major plot mechanisms but acts as an emotional catalyst.