[@VizRiel] He also seems quite powerful in that he has a lot of abilities (albeit cool and distinctive ones, I'll give you that) that seem like they add up to A-rank, while also having really useful skills. Whereas the other characters are mostly balanced around a trade-off between those two things. In fact, he kind of has a summon contract and possession contract in one, both of which I'd estimate to be B-rank on their own.