DxD: The Multiversal Demon at Your Service! (Multi-Cross)

Extra-Dimensional Demon and Dimension Lord If the mystic folk of the Marvel world were to hear these two titles, they would surely tremble in fear at the end of their world. And why wouldn’t they? Beings who bear those titles treat countless worlds and planets as nothing more than their daily meals. The most infamous of them all is none other than the Extra-Inter Dimensional Demon and Dimension Lord, Dormammu. Now, imagine an ordinary human suddenly gaining such power after being thrown into a multi-crossover DxD world one haphazardly fused with countless other fictional universes. Chaos! --- This is a multiverse and multi-cross fanfic featuring DxD, Nasuverse, Toaru, Bleach, Jujutsu Kaisen, Campione, Marvel, DC, Monogatari, Saint Seiya, Naruto, One Piece, and more. — Description from novelcodex.org