One Piece: Establishing a Pirate Family

Great Swordsman; Three-Colored Haki
That year, the strongest pirates at sea were still the Rocks Pirates. The Pirate King had not yet found One Piece. The future top combat power of the Navy was still growing, and the Seven Warlords of the Sea were still a bunch of kids.
Charlotte unexpectedly travels to this world and begins her journey of collecting Devil Fruits to raise children.
P.S.: Join the Rocks Pirates in the early stages to develop your strength. After the God Valley incident, go solo to build up your family's power, sail the seas, collect Devil Fruits and treasures, and then enter the New World to compete for the title of one of the Four Emperors once the Great Age of Piracy begins.