Fics like A True Nephilim and his Grimoire

Born of a Seraph who gave up her grace to be with the man she loves and the smartest Satan, Nathan Astaroth was already not normal, even among devils. Especially when he receives a knockoff Companion Grimoire for his eighteenth birthday. Now he can summon strong peerage members from across the multiverse. Which is good since his parents ask him to move to Kuoh for college with his girlfriend and Knight, Gwen, a rabbit yokai. He will need all the help he can get to deal with canon. Especially when he is going to get involved with Rias and everything that followed her. If he happens to become an important part of everyone's lives? All the better. With all this power at his fingertips, he knows he is going to need it to protect his growing family. After all: With great power, comes great responsibility.

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