Saya Kōkiaru

Background
Saya Kōkiaru is the current 3rd seat of the 7th Division.

Zanpakutō
Saya has never once released her Zanpakutō in battle long enough for anyone to hear its name. John Kakusei is the only one who has ever seen Saya's Zanpakutō, but has respected her wishes to keep it a secret.