One Piece: King of the World - Chapter 345: Strike!

Traveling to a different world, a bizarre, mysterious and vast world unfolds in front of Zhao Ji. He wants to run hard in this vast world and live a free and easy life.

- Description from novelbuddy

[sexual content and lemons warning]Warning: Sexual content, lemons, Comedy, MILFs, Genius Mc and his harem.Support the novel by adding to your library and with power stones!!*****Freshly turned eighteen, John Newman, a helpless nerd, suddenly gets video game abilities granted to him. A mysterious higher power, a secret Abyss of magic beneath the surface of the normal world, mages, martial artists, eroticism, tragedy and a harem of hot girls awaits.

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.

Chen Qiu had transmigrated to an Immortal World, where in this world of immortals— there were Heavenly Dao Decrees, a panel-like “Heavenly Pride Leaderboard,” and numerous entries. ... Every cultivator, upon breaking through a Great Realm, could obtain an entry. Different entries combined to define the cultivator’s limits and directions for development. Some cultivators relied on the entry combination of “Nine Ox Power” + “Hundred Percent Accuracy” + “Ignore Barrier” to marry into the Dragon Clan and became the greatest Beast Master in history. Others relied on the entry combination of “Nonsensical Babble” + “Deceive the Junior, Fool the Senior” + “Martyr’s Command,” becoming the greatest State Preceptor in history. Meanwhile, Chen Qiu’s first entry, “Rise Through the Ranks,” allowed him to choose one out of three random entries each time he broke through a small realm. From then on... Various entry fusion techniques, astonishing the human world! ... When everyone in this world had a golden finger, it all came down to whose destiny was tougher!