One Piece: The New Member

This is the story of a boy who ate a Devil Fruit known as the Dragon Dragon Fruit, trained by the top 5 marines, and aimed to be the strongest. The boy's whole life changed after a encounter with his father and met someone tbat knows of his past. Now this boy travel with a group of pirates known as the StrawHat Pirates in search of answers. Is he a marine or pirate?
(I do not own any characters from One piece.)