Harry Potter: The Tarot Medium's Diary of Being Everyone's Favorite

[Strongest Female Villain + All Pairings + Everyone Survives] (No scenes where the heroine is humiliated or forced to endure hardship; there are scenes where she tames men. The male lead may be any one of them, or it could be all of them.)

Afross was a practitioner of a niche profession in the modern world, so niche that she was the only one: a tarot spirit medium.

While exploring a tomb to find powerful ghosts to feed her enchanted cards, she ran into a powerful ghost king. Surrounded by the king and his minions, and trapped by a complex array of mechanisms and formations, she died in the tomb.

When she opened her eyes again, she was no longer in the familiar world. She had become Afross Fawley, the young lady of the pure-blood Fawley family in Harry Potter, and the founder of a third-party faction dedicated to balancing Dumbledore and Voldemort.

What? The Order of the Phoenix is too powerful? Then let’s weaken it!

What? Voldemort’s main soul is too insane to stand against Dumbledore? Then let’s make it stronger!

You want to make me your plaything, or your test subject? Then I’ll drive the entire trial ground mad!

I didn’t choose to enter this world, but I’m more than happy to take control of it.

Everyone survives: Every person is a plaything I’ve marked. They’re mine to command, and no one but me is allowed to hurt them.

(Cedric for now. The heroine is the strongest, and there are no scenes where she’s humiliated or forced to suffer. As if! This is a story for women, after all.)