High School DXD : BORN OF SIN
A soul was sent to the world of the DXD by an entity to live there. But he was also given a SACRED GEAR which empowers him with the abilities of Sins from 7 Deadly Sins. Watch him on his journey in DXD as he fights with supernatural, and makes a harem. Not Rias hater. A MC which kills, not like a madman. And not a simp. If people agree then maybe I will give a Fate crossover, only characters not whole novel.
Harem
Akeno Himejima
Rias Gremory
Sona Sitri
Tsubaki Shinra
Murayama
Katase
Momo Hanaki
Reya Kusaka
Tomoe Meguri
Tsubasa Yura
Xenovia Quarta
Irina Shidou
Rossweisse
Koneko Toujou
Kuroka Toujou
Grafiya
Serafall Leviathan
Ravel Phenex
Jeanne
Ingvild
Yakasa
Mittelt
Kalawarna
Raynare
Jeanne D'Arc
Jeanne D'Arc Alter
Artoria Pendragon (Lancer)
Artoria Pendragon Alter (Lancer)
Ishtar
Ereshkigal
Scathach
Skadi (Maybe not sure)
No multiverse travel, just some change in plot to introduce some Fate characters.
Sheesh Too many
Well I won't butcher any character and it won't be a dumba** harem so don't fear.
Leaving it aside comment if you want to add and post their images as well at their name.
Peace