It's not long into Luffy and the gang's adventure to find the One Piece that they stumble into a group of Fishmen. However, while Arlong and his violent band of pirates made a pretty bad first impression, the truth is, fishmen in the world of One Piece are all different due to their personal beliefs, motivations, and outlooks on the world. While some may want nothing more than to inflict as much human suffering as possible, others are a lot more friendly and compassionate; needless to say, this is a species that is very much divided in its way of thinking.