Dokin-chan acts as a secondary antagonist and female partner to the primary villain Baikinman. Hailing from an alien germ species, she possesses an orange-red body, white facial features with green eyes, pink shoes, white hands, a single antenna, and a long tail.

Her personality blends selfishness, greed, and childishness with occasional kindness. She often demands Baikinman fulfill her requests for food, items, or people, yet flees during confrontations. Despite her antagonistic nature, she exhibits care for Baikinman and harbors an obsessive romantic fixation on the hero Shokupanman, decorating her living space with his merchandise and devising elaborate schemes to win his affection.

Key relationships define her character. She maintains a dynamic partnership with Baikinman, mixing rudeness with underlying loyalty. Her younger sister, Kokin-chan, rivals her for Shokupanman's attention, leading to sibling conflicts. Horrorman shows unrequited affection for her, which she ignores.

Her equipment includes a pink UFO utilized for transportation and hostage-taking, and a discontinued dual-pointed staff capable of enlarging or shrinking objects on contact. She mishandled this staff during critical moments, leading to its eventual disuse.

Notable narrative moments include trapping Currypanman on an island after a failed attempt to lure Shokupanman, resulting in an unexpected temporary friendship. She disrupted a classroom to force Shokupanman into modeling for her artwork. She also endangered Shokupanman by orchestrating accidents to create nursing opportunities for herself.

In the film "Sore Ike! Anpanman: Mija to Mahō no Lamp," she appears as a minor character without significant plot influence.