Mushoku Tensei - Volume 8 Side Story — Enter the Mad Dog

As a precocious child, Lycoris suffers from a strange sense of deja vu. On the day her father told her about her fiancé, she realizes that her fiancé was a character from an otome game she once played in a previous life.

God plucked one of his creations from his first Earth and gave him a second chance in another one of his Earths...surprise it is in DxD! Now reincarnated as a perverted side character how will our poor protagonist handle his new identity? Well he probably wont make the choices you will want him to, that's for sure!

Humans across the world ended up joining a “Demon Kings and Heroes game”.

Several billion people were set down upon another world to act as “Demon Kings” and “Heroes”. Everyone has to chose their starting races from the start.

Zhang Nu was set in the Demon King camp.

He discovered that he could see hidden information that no one else could.
[Slime Demon King]. Low grade demon king bloodline… Not recommended!
[Kobold Demon King]. Low grade demon king bloodline… Not recommended!
[Dark Elf Demon King]. Mid grade demon king bloodline… Can be selected!
[Bloody Giant Demon King]. High grade demon king bloodline… Recommended!
[Abyssal Dragon Demon King]. Strongest starting bloodline… Extremely recommended!

In a world where dungeon runners rise to fame by mastering their classes and conquering impossible threats, Alexander was never meant to be part of it. No class. No path. Just a quiet life.When a mysterious portal drags him into a hidden realm known as his Inner Path, Alexander unlocks a class no one has seen before: Beholder. There’s no fanfare. No guidance. Only eyes that see too much, and power that threatens to unravel his mind with every use.Now, trapped in an abyssal dungeon that reshapes itself around eldritch laws, Alexander must survive alone.But with each victory, his vision sharpens. His spells twist reality. And the deeper he goes, the more the world outside should start to worry.Because when he returns-They won’t be able to look away.