MTL - Comprehensive Manga: The Wandering Ninja World Started From Questioning Payne - Chapter 1 : Exam space

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.

A guy became a brother of Iron man and got the ability to extract genes from anyone. Lets see how he changed the Marvel World

- Description from Novelupdates

Lingyun, a fierce and savage cultivation genius takes over a dead teenager’s body. Coincidentally, they are both named Lingyun. Set in a alternate version of the 21st century, teenager Lingyun has been killed by someone with a grudge.

Tessy Brown, an only daughter of her parents, was treated badly in her marriage, but forced to endure all the ill treatment for the sake of her father's business. Three years down the line, her husband presented her with a pre birthday gift — his ex girlfriend, who he introduced as his new wife. Heartbroken and shattered, Tessy accepts divorce and gives in to her drunken desire, having sex with a complete stranger she met at her workplace.That single encounter changed her life forever, opening her to a world she never knew existed, and a life she never would have believed she lived in the past.***Cursed to abhor the touch of a woman after the death of his mate, Roman Gavriel, the Lycan ruler of the entire werewolf communities and a revered billionaire in the human communities, lived a long life of ruthlessness and loneliness.Already resigned to his fate, he decided to test different ways to end his miserable life. When one of his experiments successfully knocked him unconscious, he landed in the hospital where he felt the touch of life that aroused all of the feelings he thought he had killed and buried.At that moment, he knew he was never letting her go, not for anything or anyone in the world.