Baikinman originated from Baikin Planet, arriving on Earth as an egg that hatched simultaneously with Anpanman's birth. His core drive is to defeat Anpanman and transform the world into a "Germ World," primarily through mischief, theft, and bullying. As Anpanman's arch-nemesis, he embodies a physical representation of moral dualism. Physically, he resembles an anthropomorphic fly with a black furry body, wings, antennas, purple lips and nose, a zigzag tail, and a slimy blue tongue. A critical weakness is exposure to soap, which turns his body white and shrinks him to fly size. He travels via a personal "Baikin UFO." Baikinman exhibits narcissism, impulsiveness, and self-aggrandizement, frequently calling himself a genius scientist. He often builds elaborate robots and machines to combat Anpanman, like Franken Robo-kun, designed to electrocute Anpanman. Despite initial reluctance, he develops a paternal soft spot for Franken Robo-kun. His relationship with Dokin-chan involves unrequited affection, though they collaborate regularly. He also inserted a "Baikin Plant" into Rollpanna during her creation, giving her an evil blue heart that occasionally forces her to oppose Anpanman. While primarily antagonistic, Baikinman occasionally assists Anpanman against greater threats, albeit reluctantly. Creator Takashi Yanase indicated Baikinman harbors a latent desire for a normal life, constrained by his inherent villain role. Recent media, like the 2024 film *Baikinman and Lulun in the Picture Book*, depict temporary shifts toward heroism where he collaborates with a fairy named Lulun to defeat a giant elephant. In the upcoming 2025 film *Chapon no Hero!*, Baikinman exposes the secret origins of a mysterious boy named Chapon, challenging Chapon's hero aspirations. Baikinman appears in nearly every episode, consistently returning despite defeats. His influence extends beyond the series, inspiring parodies like Vaccine Man in *One-Punch Man* and germ personifications in other Japanese media. Specific information regarding his role in *Soreike! Anpanman: Niji no Pyramid* is not detailed in the available sources.