Ciruela Prisner, also known by the alias 席瑞拉·普利斯纳, is a young woman with long black hair featuring spiky bangs and sidehair, brown eyes, and a slim, pale figure with medium breasts. She possesses a low tolerance for alcohol. Her typical attire consists of a kimono with a forward knot obi, a headband, and a ribbon hair wrap. She wields a naginata as her chosen weapon.

Her personality is deredere, honorable, jealous, and loyal, and she uses "watashi" as her first-person pronoun. Initially serving as commander of the sixth holy knights corps, she was reassigned to the seventh holy knights corps following the loss of her unit. She occupies the roles of childhood friend, commander, rival, and soldier, and she engages in fighting.