Arcanemissile

Maxwell?

I'm glad you didn't go the mind-rape route

I feel kinda bad for the Gremory family, here they're taking in this orphan and he is planning to steal their wives and daughters

TBF Obiyo died from a paper bomb, he revived himself with a magic eye but he did die

No, most if not all of Kakashi's gen graduated by 9, they should be 6 while Kakashi is 4

Kotomine Risei

I think it would be more correct to use her maiden surname here, Aoi Zenjou, because he was her friend before she married Tokiomi.

Their magic/magecraft works differently, a Mage from Danmachi is more akin to a sorcerer, they awaken a certain number of spells and that's it while The Magi in Nasuverse are Wizards they can technically learn a wide variety of spells, but their success and their proficiency in them depends solely on them, that is excluding the crests.

It is not the greater Grail it's the world itself, Greater Grail is only applicable in the context of the Holy Grail, Comand seals, and the Servant summonings.

The mystic eyes of death perception