Luffy and Nami have been part of Oda's story since the very first draft he made when he was 19. And people still wonder why I pair them together for the end.
THEY JUST CASUALLY CONFIRMED KEN'S DAD IS AN ALIEN.Honestly this adds so many more layers to their strained relationship, especially the part where he told Kenji that his mother "taught him what it means to be human".