Senna Brag is a compact, powerfully built hill dwarf woman with a round face, high cheekbones, and a square jaw. Her chestnut hair is tied in a loose braid that reaches past her shoulders. Dark brown eyes, sharp as flint, regard the world with equal parts irritation and reluctant amusement. Her skin is darker than most dwarves in the city, carrying a warm olive undertone, though still lighter than her father's. She wears a deep blue tunic tied at the waist with a leather cord, a linen shirt beneath it, sturdy trousers held by thick leather braces, and heavy boots polished at the ankle but scuffed at the toes. A brass ring adorns her right ear. She is notably attractive, with the physical confidence and dense musculature of a dwarf accustomed to hard labor and military drill. In battle, she wears well-maintained chain mail and carries a shield marked with her former commander's device.

Blunt, observant, and difficult to impress, Senna speaks with the practical confidence of someone raised around miners and commanders. She dislikes grand speeches but has a quiet talent for saying exactly what frightened people need to hear. She is protective of the vulnerable, suspicious of polished charm, and secretly enjoys being teased by people she trusts. Her humor is dry, her patience is sturdy but finite, and her loyalty is almost impossible to break once given.

Senna Brag was born beneath the city in a family whose name carried weight long before she ever wore a uniform. Her father, Chief Brag, oversaw a district of miners, masons, and tunnel wardens, and expected his daughter to learn the practical burdens of leadership. Senna learned to read a fault line in stone, judge the honesty of a foreman's report, and settle an argument with a look before it became a blood feud. She was never content to remain safely behind a council table. When the lower tunnels were threatened by raiders, she joined the city militia and earned her place through endurance, discipline, and an unwillingness to leave anyone behind.