In the Second Generation of the Trench, He Changed To the Ruanfan Script - Chapter 8:

A lonely soul, which was placed under the care of the Lord Protector’s Manor, ended up having her lover stolen by the family’s eldest daughter and dying tragically the day before her wedding.

Somehow, she was reborn in the family as their 14-year-old first wife’s daughter, Ning Xueyan, with a startlingly familiar face.

Step by step, she will ruthlessly scheme to seek revenge as well as uncover the mystery of her tragic death.

Her former fiancee, the flirty crown prince and the bloodthirsty prince, will now bear witness to a vengeful Ning Xueyan becoming the peerless lady of her generation…

- Description from Novelupdates

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

She, the tribe leader of the Miaojiang witch tribe, was reborn as a pitiful little girl that everyone could bully.

Once feared as the Queen of Shadows, Eydis now faces her greatest humiliation: high school.Stripped of her magic, her kingdom, and (most insultingly) her dignity, she’s stuck in the body of a weak, whiny teenager with no power, no allies, and no money. And her terrifying familiars? Complicated. Her new greatest adversary? The Maths teacher.And we certainly can’t forget about that giant, pulsating eye watching from the heavens (debatable), ominously known as… The Eye… (I know, right?) that threatens to tear apart her new reality.But one thing Eydis hasn’t forgotten: shadows always trail after you.The real question is whether she’ll stand in them once more as their queen… or be swallowed by them, piece by piece.“Royal Reboot: Level Up, Your Majesty!” - a comedic dark fantasy where nothing is as it seems and every choice could be her last.A/N: Action/Romance/Slice of Life/LGBTQChapter updates weekly, weakly.While the story has a comedic undertone, darker themes are presented.