Dokin-chan, a germ originating from the Germ Planet, serves as Baikinman's primary partner in crime. Her physical design features an orange-red germ body with pink shoes, white hands, and a distinct single antenna. A prominent white facial area contrasts with orange coloration extending to her nose, complemented by green eyes and small red cheeks.

Her personality blends selfishness, demanding behavior, and greed, often manifesting as childish bossiness toward Baikinman, whom she frequently orders to fetch items or capture individuals. Despite this antagonistic role, she occasionally displays underlying kindness, particularly through her persistent romantic infatuation with Shokupanman. This affection fuels extensive daydreaming and an obsessive collection of Shokupanman-themed merchandise. Cowardice emerges during confrontations, often making her the first to retreat when battles turn unfavorable.

Key relationships define her: she maintains a contentious yet caring dynamic with Baikinman, balancing rudeness with latent concern. Her rivalry with younger sister Kokin-chan centers on competing affections for Shokupanman, fluctuating between familial bonding and conflict.

Her equipment historically included a dual-pointed staff capable of enlarging or shrinking objects, though its usage diminished over time. She operates a pink UFO for transportation and occasional hostage containment, though it sees limited combat application.

Her character arc spans multiple series installments. She debuted in Episode 13a ("Anpanman and the Bread Thief") where her fixation on Shokupanman originated. The 1991 film *Soreike! Anpanman: Dokin-chan no Dokidoki Calendar* further explored her persona. In the 2002 film *Sore Ike! Anpanman: Roll to Lola Ukigumo Shiro no Himitsu*, she appears as a secondary antagonist, maintaining her established role dynamics. Across these appearances, her core traits—self-interest juxtaposed with sporadic kindness—remain consistent.