Naruto System in One Piece - Chapter 197

Demons, devils, ghosts and monsters

Plunge the mortals weak in horrors;

Arms of gods and blades of devils,

Shroud the world in untold evils.

Lu Sheng was an ordinary civil servant in the modern world. After waking from a drunken stupor one day, he found himself trapped in a dangerous world where demons, ghosts and supernatural monsters terrorize the land.

In this world, ordinary mortals live in dark fear and helplessness, without any means to fight against the supernatural.

As Lu Sheng struggles desperately for survival, he stumbles upon a game mod he had designed for a mobile phone app in his previous life. It unexpectedly becomes his special ability, which enables him to instantly level up any skill he learns, albeit at a cost.

Thus, Lu Sheng begins his journey, striving for power beyond the reach of a mortal as he treads the way of the Devil…

- Description from Novelupdates

Cado is transported to the Dragon Ball world and unexpectedly awakens the God-Level Choice System.Ding![Saiyan “Raditz” has invaded Earth. Host, please make a choice!][Option 1: Ignore it.Reward: Namekian Bloodline (Grants limb regeneration!)][Option 2: Face Raditz head-on and defeat him.Reward: Legendary Super Saiyan Bloodline (Top-tier talent, completely overpowered!)]Without hesitation, Cado picks the second option.Frieza: “How did the mighty emperor of the universe end up as his servant?”Cell: “Damn it! Why did no one warn me that such a monster existed in this timeline?”Beerus: “If he wanted to be a God of Destruction, my position would've been his already.”Grand Priest: “I acknowledge Cado as the strongest!”With unparalleled power, limitless potential, and the ability to reshape the Dragon Ball universe, Cado's journey begins!(Harem only includes 2 women)

Oscar, a destitute young boy, died in a tragic accident and was reborn in the forgotten realm. As a member of the lowly Birch tribe, his solace comes from the fragments of a guardian's spirit, residing in his soul. After the decimation of his family in the hands of a powerful race known as the dreads, he embarked on the part of revenge, leading him to the path of transcendence.

God gave me one more chance and finally came back after four hundred years.

As soon as I realized I returned, I decided that ‘no one should have pride.’

My goal was to destroy the country. So, I grew up with a genius prince who lived in hiding before returning.
He took up the empire for me and I left him for him to achieve his goal.

‘I came to pick you up Charlize Ronan.’ Dylan, who became a perfect tyrant after a few years, found me after searching all over the continent.

‘Why did you flee and run away?’