Hatched from Baikin Planet on the same day as Anpanman's birth, Baikinman embodies their intrinsic opposition from inception. His design, inspired by the demonic Beelzebub, reflects his nature as a personification of bread mold and disease. Physically, he manifests as an anthropomorphic fly: black furry body, purple lips and nose, light pink eyes, functional fly wings, antennae, a zigzag tail, and a slimy blue tongue. Contact with soap or cleanliness causes his body to turn white and shrink drastically. Rude, loud, narcissistic, and impulsive, Baikinman obsessively dedicates himself to defeating Anpanman and spreading germs, declaring this his reason for existence. He frequently steals food, exhibits gluttony, and harbors a deep aversion to cleanliness. Yet, creator Takashi Yanase indicated an underlying desire for a normal life conflicts with the role imposed by his origins. His relationships reveal complexity: Anpanman is his eternal rival, though they occasionally cooperate against greater threats; he holds unrequited affection for his partner Dokin-chan; he created Franken Robo-kun, avoiding its electrocuting hugs but displaying a subtle soft spot for the robot. He also implanted a "Baikin Plant" within Rollpanna during her creation, granting her an evil blue heart he could manipulate, though she often defies him. Baikinman employs mechanical ingenuity, constructing elaborate machines and robots like the Baikin UFO for transportation and combat. His primary weakness remains soap and water, drastically reducing his size and power. Narrative developments explore facets beyond pure antagonism. Magically trapped in a storybook in the 2024 film *Baikinman and Lulun in the Picture Book*, he reluctantly partners with the fairy Lulun to defeat a giant elephant, temporarily becoming a "warrior of love and courage". The upcoming 2025 film *Chapon no Hero!* further develops his role as an agent of conflict, where he exposes the secret origins of the aspiring hero Chapon, forcing the boy to confront his identity. This recurring narrative positions Baikinman as a catalyst for thematic struggles between inherent nature and aspirational ideals.