Thiriswen is a tall, slender elven woman with ashen hair and green eyes - though one of them seems to have been blinded, a number of unsightly scars betraying what may have been the work of beasts. Feathers and beads are woven into her hair, though often hidden by a cloak-hood.

Her face is constantly covered in a dark mask, but occasionally the curve of her lips or the underside of her nose can be made out - sometimes other marks that don't belong on an ordinary face. A glimpse that settles too long on her face forces her to look away, her eyes betraying a sudden anger.

Her elven armour bears the weathering of countless seasons, and seems to have been hastily repaired time and again in the field. A quiver filled with arrows rests slung over her back and she carries a shortbow, an elegant sword, knives and a number of items to make traveling easier.