Isahaya

Isahaya (諫早) is a member of the Amakusa-Style Remix of Church and Itsuwa's grandfather.

In volume 16 it is revealed that he is Itsuwa's grandfather and the likes the idea of pairing her with Kamijou Touma.

During the events of the volume 16 he fought with Kanzaki Kaori and Kamijou Touma against Acqua of the Back. He later appears in volume 17 with the other members of the Amakusa Church.

In the anime he can be spotted in fourth episode of season 2 fighting the Agnese Forces.

Abilities
His main weapon is a mace.