Undefeatable – League of Legends - Chapter 5: Duo Top

Jason, a young man who died after getting involved in a brutal accident that killed him reincarnated into the exact novel he was reading on the night he died.He was reincarnated into the novel he was reading before his untimely death, as a baby who had just been birthed successfully. From his birth he was shown no love due to his non-existent aptitude in magic.Lucky for him, he awakened the Talent system.A system that allowed him to copy talents; skills that individuals excelled at, the skills that made said individuals the cream of the crop. With the exact same mastery of the person he copied it from.The system when trying to increase his aptitude for mana only managed to decrease it even lower blessed him with nature energy to passively strengthen himself.With no magic and a system that allows him to copy talents, watch Jason climb through the ranks of the world and become the strongest!...[Host can choose a talent to copy: Null eyes, War God's Embrace, 30 Blade movements, Advanced War Tactics]

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.

Forcefully brought over from the modern world to an alternate world, Wang Chong felt detached and lived his life aimlessly.

However, when calamity struck and he saw his family and everything he cared for being torn apart, he felt regret.

Thus, he stood up and eventually became the Grand Marshal of the Central Plains, leading an army against those who seek to destroy all he cherished.

Yet, despite all his efforts, it was already too late to reverse destiny.

But before his death, a shooting star, the same one which brought him to this world, appeared before him, and he was given another chance to undo his regrets.

- Description from Novelupdates