Yakumo is tall and elegantly proportioned, with a lean, athletic build sculpted by lifelong sword training. Her skin is fair with a subtle healthy glow, medium-length black hair usually tied in a practical low bun or left loose and slightly messy. Her pitch-black eyes are sharp and calm, almost light-absorbing. A thin pale scar runs diagonally from left cheekbone to jaw, a memento from her final test under Adachi. Another long scar crosses her torso from collarbone to hip, usually hidden.