One Piece: The Whole World Hunts Me, but Killing Makes Me Stronger

[System + One Piece power fantasy + pirates + battles + invincible protagonist + character growth]

After his soul transmigrates into the body of a pirate in the world of One Piece, Ethan is hunted by almost every faction in the pirate world because he has a lead on the "Demon Gems," which can boost a person's power for a short time.

Facing the desperate situation of being surrounded by the Marines from the start, Ethan unexpectedly awakens a random rewards system.

By defeating or killing opponents, he can obtain random rewards.

[Ding! You've obtained Armament Haki: "Flowing Cherry"!]

[Ding! You've obtained Observation Haki: "Future Sight"!]

[Ding! You've obtained Conqueror's Haki!]

[Ding! You've obtained an immortal Devil Fruit: "Awakening"! Note: No side effects]

... Hearing the system's notifications ring out in his mind, Ethan smiled.

"If the World Government hunts me, I'll destroy the World Government."

"If the Four Emperors and Shichibukai hunt me, I'll kill the Four Emperors and Shichibukai."

"In short, when I rule the world, all my enemies will be destroyed."