B

Like many parasites, B believed humans to be the lower species. Though Migi had failed to take complete control over his host, he held no ill will towards him and instead offered Migi multiple chances to join him in hopes of prolonging their lives. He is also shocked when Migi kills him to protect his own human host. He is somewhat philosophical, comparing human eating habits to their reactions to the mincemeat murders. He also advises Migi to read more when Migi questions if he can really transfer hosts.

B appears to be a middle-aged man of average height with shaggy blond hair, and is seen wearing a purple vest jacket. In the manga, B appears to have blond and black hair. His face is younger, as well as much more serious and pointed. He is also more muscular and tough looking, giving him the appearance of a punk. He has black paint or markings around his eyes and wears a black sleeveless shirt and jeans.