|First Appearance||Devilman Lady|
Seiji was a small dog with a white pelt. His exact breed is never actually stated, but he resembles a Shiba Inu, a popular Japanese breed of dog.
Seiji was used by his owner Seiji Hayami to help create the illusion that Jun Fudo was an ordinary woman living on her own when Mr. Boris of the Grumech Embassy sent an agent to spy on her. Jun frequently cuddled the dog saying how cute he was much to the jealousy of his owner.