Maybe a Fake Gintama - Chapter 27: Human Beings Will Not Change Easily! Old Friends Too!

Genius, antisocial, solitary, intractable , maniacal.

At the turn of every era, it is he who raises the flag of the rebel cross.

Winners take it all, losers take the fall.

He who brings order to a chaotic world, assembles talents and masterminds.

He who hides among the crowd, yet stands on the top of the world.

— The one and only, him.

- Description from Novelupdates

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

In her previous life, she had wronged and divorced the man who truly loved her, and by the time she realized her mistake, it was too late.Now, granted a second chance to make things right, she carries the knowledge of the future. Will she seize this opportunity to redeem herself?“Hubby!” she purred playfully, her cheeks flushed with embarrassment.“Call me that again, and I might just devour you right there,” Rowen warned, his gaze locking onto hers with a smoldering intensity.Follow Vanessa as she sets out to seduce her ex-husband in this dramatic, heart-pounding tale.

I, Zatiel, Abyssal Lord, Ruler of Death and Destruction, Nightmare of Dys, have AWOKEN!!!!!.

His life contains events that can shake the universe:
-Fighting against Tiamat, Creator of Evil Dragonkind, in the first circle of hell, while billions of demons and devils butcher each other beneath them
-Start a World War against the Heavenly Race, and transform himself into a Golden Sun while he slaughters their greatest warriors, the Archangel.
-Enter the Final Gate and fight against the Outer Gods.
-Tearing the nine levels of Baator during his battles against the Prince of Evil, Asmodeus.

With his memories as a ruler of the Abyss and a Universal Existence, Zatiel will rise again.