Fenrir "Fen" the Wolf was an anthropomorphic male Mythsetian cyborg wolf, the deceased brother of Anubis and father of twins Okami and Ezo. Fenrir had light grey fur with red markings and possessed a number of cybernetics and was gifted in technomagic. The circumstances of his death are unknown.
Fenrir is named after Fenrir, a monstrous wolf from Norse mythology.
Fenrir has a blue and pink ribbon tied around his right forearm. These were later given to his children, who used them as headbands.