Fenris is a massive, white furred wolf with white eyes, long tail and very muscular body. He prizes himself in his strength, being able to wrestle down dragons and dinosaurs with his power.
His is quadrupedal, walking on all fours as his body resembles that of a muscular timber wolf, but with the exception of a much longer tail. He is quite old, possible over a millenia, and has quite calm personality despite loving to battle other mythic beasts. He spends most of his time sleeping.