The prologue is set about 4 years before the start of the anime and when you return it's the day before Rias releases Gasper.
I also decided to remove the cooldown on the dragon shouts because I think it's stupid and I'm also adding some of my own dragon shouts and powers as well as enchantments.
Name: Y/N L/N
Look: You
Hair Colour: H/C
Hair Length: H/L
Eye Colour: E/C
Age: 14 in the prologue and 18 by the time you return
Title: Dragonborn
Race: Human
Backstory: When you were 6 your parents were killed by a fallen angel while you and your parents were having a family day out, and when the fallen angel killed your parents Rais appeared (by this time you already met her because your parents were good friends with the Gremory family) and killed the fallen angel and decided to take you back to her family's mansion where you were looked after by them. You were given the choice to change your last name to Gremory but you decided not to as a way to remember your parents. Some times while Rias was on Earth helping to make sure there were no fallen angels hiding in Kuoh and during the day you'd sneak out to go see Rias but you eventually were forced to come back by Grayfia.
Amour:
Likes: Serana (Wife) Rias and her peerage (minus Issei, at first), Sona and her peerage (minus Saji), Gremory family (forgot to add this earlier), Irina, Ravel, Serafall (forgot to add this earlier), his friends in Skyrim, Greybeards, Paarthurnax (considered as a brother), Odahviing & Durnehviir (basically his familiars), his dragon shouts/ powers, his Valor (dragon version of a peerage)
Dislikes: Perverts, Perverted trio, Saji, Alduin, the blades, the people he cares about in danger
Weapons:
Harkon's sword
2 silver daggers
Bound sword (any one-handed sword you want)
Auriel's bow (enchanted to have infinite arrows)
Dawnbreaker
Aetherial shield (enchanted to absorb any magic attack that is blocked by the shield and then release the stored magic from the big orb in the upper-middle section of the shield)
Anything else will be revealed in the following chapters.
That's it for the character info and the next chapter will be the prologue and the chapter after that will be when you return to the DxD universe. So I'll see you in the next chapter, see ya!