Doquín, known as Dokinchan in Japanese, appears as an orange-red germ with striking green eyes, pink shoes, white hands, and a single antenna. Her face features small red cheeks and a nose, marked by a continuous orange line extending upwards. She stands as Baikinman's primary female accomplice, frequently joining his schemes against Anpanman and friends. Her personality blends selfishness, vanity, and demanding behavior; she often bosses Baikinman around to satisfy her cravings for food, objects, or people. Despite her antagonistic role, she occasionally reveals flickers of underlying kindness. She burns with an intense romantic obsession for Shokupanman, driving her to extreme actions like ambushing him or crafting intricate traps to win his affection. Her living space overflows with Shokupanman posters and plush toys, showcasing her fixation.

She has a younger sister, Kokinchan; the pair are locked in a rivalry over their shared affection for Shokupanman. Though they sometimes cooperate, their interactions often erupt into conflict. Early appearances featured her wielding a specialized staff that could enlarge or shrink objects based on which end touched them, though its use was inconsistent and it eventually faded from use. She pilots a pink UFO for transport, sometimes using it to snatch hostages for Baikinman's plots.

While her core traits remain unwavering, certain episodes show situational shifts, like developing temporary camaraderie with Currypanman when stranded. Her deep vanity leads her to believe she is universally adorable, a perception frequently contradicted by others' reactions to her actions. Her central role persists as comedic antagonism alongside Baikinman, consistently punctuated by her unrequited passion for Shokupanman.