Mrs. Shioi is a middle-age woman with short hair, and freckles and wears casual clothes.
Mrs. Shioi is a very confused and panicked woman toward Rina who was claiming to be her daughter while still possessing Saki Shizukume's physical appearance. Later she was hysterical with fear and shock when Juuhachi began to attack and severed Rina's leg off.
Later when Tempest began and all of humanity was being turned to sperm, she expressed worry, sadness and regret as she had just been reunited with her daughter only to be separated again, which shows that they possess a loving mother/daughter relationship with each other.
- The kanji for her married surname Shioi (潮井) means tide (潮, shio) and well (井, i).
- When written in different kanji, Shi can mean death (死) and four (四).
- Her husband was never seen or mentioned, suggesting that Mrs. Shioi is divorced or widowed.
- She looks to be in her early 50s.
- Mrs. Shioi's name and maiden surname are unknowns.