Not everyone in the One Piece universe is as loud, brash, and energetic as Monkey D. Luffy. While there are definitely many characters, such as Robin or Zoro, who can come across as a little introverted, there's also those who would be considered shy due to their lack of confidence, and how easily they get nervous when the going gets tough. Though many of these characters have a good heart, and are always trying to push through this difficult personal trait, it's still come to be a lovable part of who they are to the fans, at least, for some of them.