One Piece: Building the Ultimate Persona

"A small goal: become CP9's greatest genius in eight hundred years!"

Kitahara Tsune transmigrates into the world of One Piece. He has neither the destiny of the D. Clan nor any innate racial advantages, yet he possesses the most extraordinary talent of all-what the world believes about him becomes real attributes, transformed into his power.

If they believe he is a [Genius], he can grasp concepts by analogy and learn anything at lightning speed. If legends claim he possesses [Unrivaled Haki], he gains overwhelmingly powerful Haki. If songs sing of his [Immortal Body], he becomes impervious to blades, bullets, and every poison!

And when the entire sea believes that he can reach [Laugh Tale], he becomes capable of anything!

Thus, the most era-defying legend of a persona sets sail!