I'm not going to lie to you. One Piece can be downright silly. From snail phones to robots wearing speedos, the world of One Piece can be just plain nutty. But don't let that fool you. Like any good show, One Piece can have you laughing one moment and crying the next.
Every crew member on One Piece has a tragic past that affects their current motivations. Luffy's recklessness hurt someone he admired. Zoro made a promise that he can never fulfill. Usopp learned to lie to protect someone he loved. Sanji learned about true sacrifice. And Nami learned about doing what you hate to protect the ones you love.
I know I'm being vague on the details but I don't want to ruin it. Nami's backstory in particular is incredibly powerful.
Each one of these moments molded and shaped the crew into the people they are today. And out of these tragedies, the crew formed their life goals.
Which is what tomorrow is about, dreams.