One piece: Reborn to be the strongest

Reincarnated in the world of One piece as Gol D Roger's eldest son. Gol D Leon walks in his own path to become the world's strongest man to ever live. He is a born genius in using haki He hates the word justice that comes from mouths of marine He builds his own country where every race can live in peace. He didn't have any system. He works hard for everything. He will protect his brother. Boa Hancock will be his wife.