Dokin-chan partners with Baikinman in his schemes, exhibiting a selfish, demanding, and greedy personality. She frequently bosses Baikinman around to fetch items or people. Despite this, she occasionally shows underlying kindness, particularly concerning others' well-being when it aligns with her interests, and often retreats from conflicts facing defeat.

Her defining trait is an intense romantic obsession with Shokupanman, sparked during a bread theft. This fixation drives her to extreme measures, including elaborate traps and manipulation to gain his affection. Her living space overflows with Shokupanman merchandise, and she frequently daydreams about romantic scenarios involving him. This obsession fuels rivalry with her younger sister, Kokin-chan, who shares similar feelings.

Her relationship with Baikinman alternates between treating him as a servant and showing subtle care. She relies on him to execute plans yet demonstrates concern for his safety in perilous situations.

Her equipment historically included a dual-pointed staff for enlarging or shrinking objects, later discontinued. She primarily uses a pink UFO for transportation; its grasping appendages sometimes restrain hostages during Baikinman's schemes.

In the "Kuroyukihime to Motemote Baikinman" storyline, Princess Snow-Black captures Baikinman after becoming infatuated. Dokin-chan participates in efforts to rescue him, collaborating with Anpanman to counter Princess Snow-Black's influence of turning everything black, placing Dokin-chan in an atypical retrieval role.

Her character design features an orange-red germ body with a white facial section extending to her nose, green eyes, rosy cheeks, a single antenna, a long tail, and pink footwear.