Individual lore: was created but during his birthday, there was an accident where he ended up in the hands of people who didn't really want him but also couldn't just return him. He's been treated as a fighting dog, and as an animal in gerenal rather than an intelligent being. As a result, he never learnt to talk, read or write as he spent most of his life inside a cage surrounded by dogs in a dark warehouse. The illegal ring was raided by a mafia and while most creatures were either put down or handed over to sanctuaries, Fenrir alone was kept.

Shared lore: trained to behave properly by Mono, to read and write by Forest and how to socialize with humans by Amor. Is very scared of Mono (he got put in his place very early on) and highly respects his power. Sometimes has mock battles with Yui and is currently mostly a guard dog. He's prohibited near Rafflessia (the family head's daughter) without a leash or others present.

Personality: brutally honest and will often go berserk when fighting. The lower jaw piercing prevents him from lying his head flat on the ground so he's never had a good night's sleep. Tries to avoid everyone, since all he knows is to trust himself for survival. Has yet to learn about the concept of commarades or teammates but will only listen to Mono'c commands.