Fenrir is a lean human with a soft, open face that contrasts sharply with the wary alertness in his gray-green eyes. His brown hair is worn just past the jaw and tied loosely with red thread. A faint crescent of coarse silver hair marks the left side of his neck, the first visible sign of the lycanthropic curse. He dresses in a weather-stained burgundy coat over a cream shirt, fitted leather armor, and quiet boots. His fingers are stained with ink, resin, and old blood from years of instruments, locks, and hurried escapes.

Fenrir is warm, observant, and theatrically polite, especially when surrounded by people who underestimate him. He collects local songs, remembers servants' names, and treats every conversation as a possible duet. Beneath his charm is a constant, exhausting self-surveillance. He studies his hands, teeth, and shadow for signs that the beast is winning.

Fenrir was raised in a riverside district where songs traveled farther than coin. His mother repaired concertinas and his father copied legal documents for whoever could pay, so Fenrir learned early that a pleasing melody and a convincing signature could open the same doors. He became a traveling performer, but his performances were cover for small burglaries, forged invitations, and the occasional rescue of someone whose debt had become a death sentence. He preferred clever thefts that embarrassed the powerful over violent work, and his reputation grew among both tavern crowds and locked-room criminals. The curse came after Fenrir accepted a commission to steal a silver reliquary from an isolated manor. The reliquary contained no treasure, only a blood-dark tooth sealed beneath a saint's image. When Fenrir opened it, the manor's last surviving heir attacked him in wolf form. Fenrir escaped, but not before the creature's bite changed something inside him. Now moonlit nights bring heightened senses, violent dreams, and a growing fear that the beast is learning his name. Fenrir continues adventuring to find a cure, gathering songs and secrets along the way. He has begun studying the bardic traditions he once treated as mere stagecraft, hoping music might one day give him command over the curse instead of the curse commanding him.