Tsuu

Tsuu (つー) is a derivative of Shii with Ayah's face. Like Ayah, they are violent and unpredictable. They're often used as a minor background character.

Their name comes from the fact that the katakana characters for "shi" (シ) and "tsu" (ツ) look similar.

Tsuu doesn't have a consistent gender, but they're usually depicted as female.

Sources:

• Nameless Rumia's Wiki
• 2ch AA Illustration Project
• Pixiv Encyclopedia