A lean, weather-hardened human man of average height, with a broad-shouldered frame built by years of hauling rope and cargo. His wind-burned face is marked by a narrow scar through his left eyebrow, and his dark brown hair is kept short with a rough, uneven cut. His gray-green eyes are alert and restless, always measuring exits, pockets, and the mood of a room. He dresses in a salt-stained shirt, worn leather armor, patched trousers, and a weatherproof sailor's coat.

Brennan is quick-witted, suspicious of easy promises, and fiercely independent. He can be charming when he needs cooperation, but his humor tends toward dry remarks and pointed observations. He respects practical competence more than rank or refinement, and he has a surprising tenderness for people struggling to escape poverty.

Brennan Gwill was raised in the cramped dockside warrens of a great human city, where rent was paid in copper, meals were stretched with water, and a quick hand often mattered more than an honest one. He learned early how to climb rigging, read a tide, and spot a mark who had more coin than sense. His talent for slipping through crowded markets eventually earned him a place aboard a merchant vessel, where he signed on with dreams of distant ports, buried fortunes, and a name that would mean something beyond the alleys where he was born. The sea gave him hard work, a dozen bruises, and stories that became less impressive each time he told them. Years later, he returned to the city with no treasure, no celebrated reputation, and barely enough coin to replace his ruined boots. The voyage taught him patience, navigation, and the value of knowing when to keep his head down, but it also left him furious at the life he had accepted. Brennan now intends to change his fate by whatever honest means remain available, though he has not yet decided how much dishonesty counts as honest when survival is involved. He takes dangerous jobs with a sailor's nerve and a thief's caution, determined that his next return will be different.