Age: Unknown
Birthday: Unknown
Blood type: Unknown
Height: 139cm
Weight: 30kg
Shoe Size: 20 cm
Likes: Observing, sleeping, sunny spots, blue-black fish
Hates: Humans, construction sites, shoes
Special skills: Hide-and-seek, specifically hiding
When the Alya students attack the Kairoushuu and the Banten ninja, she pursues Miharu and Yoite. Upon the death of the leader of Kouga Village, she receives the scroll containing Kouga's forbidden techniques, Daya, and subsequently passes it to Miharu.
When not in human form, Shijima is disguised as Miharu's cat, Shiratama, a role she has maintained since before Miharu's birth. Her appearance is similar to that of the spirit of the Shinrabanshou.
Like Aizawa, she survived experiments conducted by the holder of Shinrabanshou, a medical practitioner, during the Edo Period. The holder used the Shinrabanshou to give a human heart to a cat, transforming it into Shijima. Due to these experiments, it is implied that she is at least a century and a half old.
