One Piece: I'm Luffy's Unlucky Younger Sister

"Little sister, come sail the seas with me!" Luffy tried to drag Karen along on his voyage.

"You want me to go to sea and become a pirate? Only if I'm captain. At the very least, I have to be vice captain!"

"No problem! You're the vice captain from now on!"

Much later: "Why did I ever get on your ship?! I'm such a sucker!"