After Transmigrating as a Demon, I've Been Adopted by Angels! - Chapter 30

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.

Waifus, Mechs, Magic! Witness a mind-blowing ride of spell-slinging beauties, earth-shattering mech wars, and an arcane system so deep you’ll lose yourself in its brilliance! Empires crumble, celestials clash, and the birth of legends in the most explosive, heart-racing epic you'll ever read!Jack Squire, a professional debris collector in Earth's orbit, witnesses the unimaginable — the colossal magical sigil igniting the sky above his hometown, Germund. As communications fail and soon an apocalyptic light blasts skyward and splits the moon in half, horrifying chaos dawn.Determined to seek the truth, Jack must navigate a perilous descent into a war-torn planet, where arcane magic and advanced tech clash in a brutal conflict between two empires.Osten Empire with its arcane: Magic & Spells (Essence and Slot System)V.S.Dunkelheit Empire with their war armours: Armatus (Think mecha)In this gripping sci-fi and fantasy adventure, ~one of a kind! Jack's quest to uncover the truth behind the cataclysm and save what remains of his world leads him into the heart of a war that shall decide humanity’s fate.

He died on the wedding of the girl he had a crush on, after a long and successful career. After convincing Yama to send him back to the world, he decides to fix the areas in which his life went wrong. Realizing the lack of love and romance in his past life, he sets out to conquer the hearts of various women.

- Description from Novelupdates

I want to go to the fairy road, step on the gods, I want to be happy!
Repair the baby, cast the fairy body, and smash the fairy mark!
The starry sky opens, the gods fight, and the depths of Chen’s home are back!
I am Xiao Hua, this is the story of my god that I am in the world of immortality, creating souls, dying, dying, and not dying.

- Description from Uukanshu translation