Toaru Majutsu no Index: Genesis Testament - Volume 1, Afterword

After dying in the world of One Piece, he was reincarnated once again this time as Neji Hyuga. But fate was no kinder here. With his father dead and the cursed Caged Bird Seal looming over him, for his survival he made a ruthless decision....

Wang Yi was reborn into a world that swallowed the starry sky. After eighteen years of ordinary and extraordinary, he finally met the conditions on the eve of graduation from high school, activated his own golden finger, and signed in for the first time.

[Ding, congratulations to the host for successfully signing in, signing in for the first time, and signing in to the earth, special rewards will be given to reward the first karma of the Nine Tribulations Secret Code! 】

[Your genetic level has increased three times! 】

“…”

Previously one of the ten greatest Martial Emperor, Gu Feiyang somehow died near the mountains of Heaven Wave.

Fifteen years later, Gu Feiyang crossed through the cycle of rebirth. He was back! But this time, he was in the body of Li Yunxiao. Since then, Li Yunxiao started a treacherous journey. The world is in turmoil once more!

- Description from Novelupdates

Alex used to be a person with an incomplete soul and died at the age of 20 without being able to cultivate.

Mysteriously, he once again woke up in a different world, in the body of a young man with the same name, facial features, and even soul.

Yes, the other half of Alex's soul was actually born as this young man but since this young man's soul was also incomplete, just like Alex, he also couldn't practice martial arts.

After both incomplete souls fused together, a System suddenly appeared and Alex could feel a kind of connection with this system as if he himself was the creator of this system.

The System grants him the ability to see everyone's attributes and duplicate them.

Follow Alex's journey to the peak of martial arts as he'll overturn both heaven and earth and will even try to Replicate the Heavens.