『Hairu Ihei』

Hairu is a First Class Ghoul investigator and the partner of Koori Ui. She is the deputy leader of S1 Squad.

She is a veteran of the Owl Suppression Operation and serves as a member of Squad 0, commanded by Kishou Arima.

Ihei comes across as a normal young woman, though already a veteran Investigator. She eagerly and politely greets the Quinx, and is happy to finally have met people her own age. Though their superior, she wants to be treated as their peer and seems a bit uncomfortable with how young she is compared to everyone else she works with. She seems to have quite a tomboyish personality.

In battle however, Ihei is cold and ruthless. She maintains a casual personality in battle, even when fighting and killing ghouls. She has a habit killing her enemies brutally, and often leaves behind a gruesome trail of remains of her kills.Mairo leaped between the two women and took the fatal blow. He was torn in half, but still able to use the momentum of his leap to attack Ihei. Ihei had a vision of Arima and herself when they were younger and smiled before she was decapitated.