A clever, long-haired Persian cat with show-winning experience transformed into a sentient character, who becomes Carl's companion and helps him navigate the dungeon.

Carl and Donut’s trainer who provides guidance and assistance, possessing extensive knowledge of the dungeon's complexities while dealing with his traumatic past as a crawler.

A kua-tin working in the PR department of the Borant Corporation, who becomes involved with Carl and Donut, offering a nuanced perspective on the ethical implications of the dungeon show.

A former crawler who now hosts a popular talk show, helping Carl and Donut increase their popularity and providing strategic advice for surviving the dungeon.

Two dungeon crawlers who employ an aggressive strategy that conflicts with Carl's approach, becoming antagonists in the narrative.

Carl's ex-girlfriend and Donut's original owner, whose actions significantly impact Carl's decisions and the unfolding events in the dungeon.