Death March kara Hajimaru Isekai Kyusoukyoku (WN) - 18-19. The Princess’s Career

He doesn’t just tame beasts—he conquers everything.Nothing is off-limits to Rex. Beasts. Humans. Gods. Artifacts. If it has a will, it belongs to him. He tames the untamable.“I’ll choose death over submission.”Foolish!“I’ll tame the soul—or devour you wholly.”Ding…[Taming {Primordial One's Soul} Successful]From the lowliest creatures to the most powerful gods, Rex's reach knows no bounds. His taming system grants him power over life, death, and even fate itself.No beast too mighty. No human too proud. No artifact too ancient.What if even the very consciousness of the world bows to him? Will he stop there or search for a bigger ground to dominate?---What to expect?- Overpowered MC- Fast to medium pacing of progression.- A fantasy world filled with diverse creatures and power system.- Join Rex and uncover the mysteries of this magical world!

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

One rule: Survive. Everything else is optional.Reika Kagetsu doesn’t want to be a hero. She just wants to feel—pain, fear, adrenaline—anything to remind her she’s still alive.Tenshiko Academy promised her that.What she got instead? Brutal training. No rest. No second chances. And monsters—inside and out.Now she’s fighting the Shikiban: creatures born from blood, madness, and buried secrets. But the deeper she goes, the more she begins to wonder...What if she’s one of them?Power always comes with a price. And Reika is about to pay it in full.

After an accidental death, in order to continue to live, Gu Bai had to choose to go through various wonderful books to complete tasks.

Every time he became a variety of small cannon fodder inside the story, Gu Bai’s code of conduct when completing task is – by all means, don’t be inferior, don’t be shameless, don’t be upright… hold on to a golden thigh.

… N times after transmigrating

Cannon fodder: (angry contempt) … You’re already so powerful, why are you still shamelessly holding on to a golden thigh to deal with us!?

Gu Bai: (deadpan) That… holding and holding… got used to it…

- Description from Novelupdates