Luffy, a Yonko, is one of the strongest pirates in One Piece, with room to grow after Elbaf. Garp, known for Haki & training, will be eclipsed by Luffy post-Elbaf arc. Mihawk, Big Mom, Five Elders ...

So far, in the Straw Hat Pirates, there has been no official romance between crewmates. Some fans, however, believe the most recent One Piece spin-off hints at a romance between Luffy and Nami.