A Bored Lich - Chapter 15 - Lava Boar (part 2)

Waking up in the body of a 6-year-old boy a few years before Cintra is destroyed, Madara receives a system that gives him the ability to gain the powers of Uchiha Madara.[The peak of Uchiha Madara's system is before he becomes the ten-tails jinchuuriki.]The system's percentage does not stop Madara's power, but rather the system's release. After all, I don't want to see a character who goes around killing everyone from the beginning of the story.

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

Cain was living his best life as the leader of CROSS, a gang ruling Zone A, District 4.At 21, thanks to constant cigarettes and booze, he looked older than his years. He didn’t finish college or have a job, but he made a living through “guard fees” from local markets and his shady side business.One night, his life turned upside down when a shooting star crashed through his window, transforming into a cute fairy girl in a pink dress and rabbit hat, who declared herself the Idol-Idol Goddess!Now, Cain has to juggle being a gang leader and a rising idol star. Can he balance both lives without blowing his cover?[RPG System Style. No Harem. Drama. Romance. Face Slapping. Idol. Magical Realism. Urban Setting. Beautiful Female Lead. Strong ML. Smart ML. Handsome ML. Cold ML] XD

Chu Hao was reborn in another world. With the memory of his past life, he embarked on a journey to conquer the heavens and the worlds, and finally became the Eternal Heavenly Emperor.[Rebirth], [Exploration], [Battle]