MTL - After Wearing the Book, I Became the Second Mary Sue - Chapter 430 taste of dog food

A dancer who was killed by a serial murderer found himself occupying the body and taking on the life of Brian Morse, a patient with anti-social personality disorder. As Brian, he has the look, he has the brain, he has the charisma, but he also has something that somehow always attracts psychopaths…[The story mentions 3 reality shows and crossovers with the American drama series Dexter. SLASH]

- Description from Novelupdates

In a world without gods, where the laws of magic are written by the mages themselves, balance is fragile, and darkness reigns. Multiple dimensions surround it, watched by beings with dark and greedy intentions. This is a magical universe, unstable, marked by constant changes, betrayals, and bloodshed. At the center of it all, an ordinary man emerges, carrying a biochip capable of deep analysis and data recording. With it, he embarks on a relentless journey of genetic enhancement, seeking to ascend beyond the limits of existence. Without divine protection, without charms to shield him or overwhelming powers, he must survive in a world where threats are ever-present, and the fight for survival is relentless. Here, the only rule is to conquer or be consumed. A dark fantasy filled with dangers, evolution, and the relentless pursuit of supremacy.

In her previous life, Fang Qing’s parents passed away one after another, and she herself died tragically in a dark mental hospital.

When he opened his eyes again, he accidentally returned to the time when he was seven years old.

This time Fang Qing was cautious and vowed to change the fate of himself and his family. She studied hard to get ahead, and by the way, she won over the handsome boy next to her who was always blushing.

- Description from novelbuddy

Zavier met Cosmic Consciousness after his death. He was satisfied with every system that Cosmic Consciousness exhibited, so he wanted all of them. Surprisingly, the Cosmic Consciousness obliged him.

Zavier was reborn in an isekai full of magic and alchemy. Now, he had many routes to upgrade. Interestingly, to coordinate these systems, Cosmic Consciousness gave him the gift of being able to duplicate himself. He could clone a finite number of himself to manipulate these systems.

Magus, Alchemist, Mesmer, Tamer, Hunter, Vampire, Werewolf, Dragonknight, Necromancer.....

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By the way, it wouldn't appear NTR or some bullshit harem of courtships. MC of course will have harem but not for cliches.