Fenrir aka Rir Rir is the Great Norse Wolf. She is oldest sister of Jormungand and Hel.
She has long orange hair tied up. She also has fox ears popping out of her head.
She's very mischievous and playful as seen when she took over the school.
She first appeared in Chapter 9, acting as a transfer student but in reality she took control of all students in the campus. She was defeated by Shirogane and was later punished at Jormungand's bar.
Powers and Abilitiess
She is able to manipulate and control other people's thoughts and memories when they look at her in the eye.