Hermyte

Hermyte (エルミート, Erumīto) is a member of the Cherub Protection Service, and the host of the First-Sphere Cherub Iblis.

Cherub
Iblis (イブリース, Iburīsu) is Hermyte's Cherub which he was given by Eliza and the C.P.S., who is also known as the Angel of Hollow Void (虚数の, Kyosū no Cherabu).
 * Imaginary Number Manipulation:
 * Seraphim Form:

Equipment
Seraph Key (セラフ鍵, Serafu Kagi): Hermyte's trump card, which lets him release his and Iblis' limiters increasing his power to a greater extent and it causes Iblis to slightly takeover his body. However, for as of yet unknown reasons, it's use has been forbidden by Eliza.