In This Life, The Greatest Star In The Universe - Chapter 2:

The world ended, and from its ashes, a new society rose. One where strength was law, and the weak were nothing more than dust beneath the feet of the powerful.Malakai Von Sanguine was meant to be great, a direct descendant of one of the grand families of the dome, the Sanguine Clan. But at seven, he lost everything: his parents, his future, and his ability to evolve. Branded as worthless, his life became a living hell, forced to survive in a world where the unevolved were walking corpses.But fate wasn’t done with him yet.One fateful encounter changed everything.He evolved.What he acquired was something far beyond the limits of his clan, something most wouldn’t believe possible. A power that defied the very laws that governed their new society.Now, there is only one goal: revenge.The people who took everything from him… he will hunt them to the ends of the earth. He will burn their names from history and carve his vengeance into their very bones.No mercy. No forgiveness. No escape.They will die screaming.Or he will die trying.

Due to a mistake on his student’s part, a super Martial Artist had received a wrong class in an online game and had become a mage. He who was used to curbing violence with violence and using strength to subdue strength could only make the best out of his mistake. Taking on a new lease in life, he became a violent close combat mage. When strength and magic came perfectly together, a new gaming path had been opened by him!

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“Fireball spell? Lightning Chain? Frosted Ice Mirror… etc.”

“Wait, I came here to practice Kung Fu! What has magic got to do with me?”

“I am a mage?”

“Oh, that’s right. I am a Mage!”

“However… do you really firmly believe that I am a mage?”

“Alright then, look at my knives! Look at my sword! Look at my fist! Look at my concealed weapons!”

“What? You’re now saying that I’m not a mage?”

“If you don’t believe me, I will prove it to you: If you believe me, I will show you a performance: No one can get in the way of a mage who knows Kung Fu!”

- Description from Novelupdates

God's Seal Cathedra Rex, Part Two!Two sons of the dragon, each different; a genius elder brother and a good-for-nothing younger brother, who despite being identical twins, are worlds apart. However, they share an identical desire for peace. On the night of their birth, the moon was high in the sky.

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.