Dokin-chan is an orange-red germ character featuring green eyes, a single antenna, and a long tail. Her face is predominantly white, accented by small red cheeks and a nose, with an orange line extending to her nose area. She has white hands and wears pink shoes.

Serving as Baikinman's primary accomplice and a secondary antagonist, she exhibits a blend of selfishness, greed, and childishness, frequently demanding Baikinman fetch items or people for her. Cowardly in confrontations, she tends to flee when battles turn unfavorable. Though generally self-centered, she occasionally displays underlying kindness.

Her defining characteristic is an obsessive romantic fixation on Shokupanman, beginning with their encounter in "Anpanman and the Bread Thief." This admiration manifests through extreme measures to gain his affection, including elaborate schemes like sabotaging his dates or luring him to isolated locations. Her living space houses an extensive collection of Shokupanman-themed merchandise, including posters and plush toys, and she frequently daydreams about romantic scenarios with him.

Her relationships are complex: she bosses Baikinman around but harbors genuine concern for him beneath her rudeness. Her interactions with her younger sister, Kokin-chan, alternate between camaraderie and rivalry, often centering on their shared interest in Shokupanman.

Historically, she wielded a dual-pointed staff capable of enlarging or shrinking objects on contact, though this tool saw limited use and was eventually phased out. She pilots a pink UFO with yellow hands, primarily using it for non-combat purposes like transporting items or hostages, though she occasionally deploys it for Baikinman's schemes.

She appears in numerous franchise installments, including the film "Minna Atsumare! Anpanman World," where she participates in events involving Komusubiman and a festival robot. Her name derives from the Japanese onomatopoeia "doki" (representing a heartbeat), "baikin" (meaning germ), and the suffix "-chan."