I Created Scientific Magic - Chapter 695 - 577 This is the Power and Authority of God!

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates

“You really want me to save people?”

Looking at the shivering victim in front of him,

Look at the [Owl’s Head Wire], [The Murderer’s Gift], [Universal Anesthetic], [Invisible Potion] in the item column…

Shiraishi touched the hideous mask on his face and fell into deep thought.

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“The Salary Thief in the Distillery”

“What does the vest do to me have anything to do with it?”

“There are limits to being a human being, I choose to be a cat…”

The magic version of Conan

- Description from novelbuddy

The human race fell under the wrath of the alien invaders. At the end, Michael, humanity's last Paragon, remained.Unwilling to let his kin be exterminated, he goes back in time to the year 4026. One week before the start of the alien invasion that marked the turning point in the war.Reborn in his young body with his memories intact, Michael will use the knowledge of his past life to his advantage.By mastering both cultivation and cybernetics, he will attain the power to protect his loved ones, with his ultimate goal being to raise humanity to galactic supremacy and triumph over the alien invaders once and for all!

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!