Senjumaru is a slender and very youthful woman with fair skin and long, black hair that is adorned at the back by a large golden ornament in the shape of a crescent moon with numerous small lines radiating outwards.

Senjumaru wears the standard Shinigami shihakushō beneath a white long-sleeved haori, she dons a further white robe fastened at the front near the center of her chest, a pair of extremely thick-soled okobo. She has six long, golden skeletal artificial arms on her back.