Even though the fanfic features a system that allows MC to access various powers from other worlds (for example: magic from Fate, magic from UQ Holder!, abilities from Naruto, and so on), I don't plan on drastically altering the DxD universe. Based on past experience, I understand that DxD already has enough waifus and fanservice, so adding extra elements would be unnecessary and might even make things worse.
That said, the fanfic will include some new characters and tweaks aimed at optimizing the DxD world and its metaphysics. For example, MC's family will be introduced as new characters, and you can easily find what they look like by searching their names on Google, except for the mother (these characters come from slice-of-life anime and originally didn't have any powers).
Current examples of optimizing the DxD world, as of writing this "note", include the history of witches, which ties into MC's family background, and a more detailed backstory of human magic, known as Merlin's magic. The first change doesn't affect the original DxD plot, but the second expands on the lore of the world, specifically the backstory of the Three Great Factions, which the original barely touched on.
The fanfic isn't aiming to completely rewrite the DxD universe. It's still the same old DxD with fanservice, busty moms, and dragons. The difference is that in this fic, the DxD world will be more logically explained and structured than in the original.
If I have any new thoughts or ideas, I'll be sure to update this chapter.
By the way, I have a question for you. While I plan to make a separate poll about this, I'm curious to hear your thoughts: what should I do with Issei? Essentially, there are two options: make him a girl (everyone's favorite genderbend) or keep him as he is and let him go after Irina and some other less popular characters. I'm not planning to kill him or take away his Sacred Gear."
One last thing: MC's rewards are only limited by common sense and creativity. So, I'd love to hear your suggestions on this!