Straw Hat Pirates/Allies

Individuals
Throughout the series there have been people who have either traveled with the Straw Hat Pirates for a short period of time or aided them in one way or another. Many of these individuals would be considered temporary pirates in a way. The most notable of these people is Vivi, as she traveled with them for almost the entire Baroque Works Saga, and even considered permanently joining them but due to her promise it seems that she is always welcome back.

Groups
Along with individuals mentioned above, there has also been various groups that have assisted the Straw Hats in their adventures. These organizations have helped the Straw Hats either to reach a certain goal or to defeat a common enemy. One of the most notable of these is the Franky Family who, along with several other characters, formed an army of sorts in order to fight against a common foe.

Anime Only
In the anime adaptation, the Straw Hats have also had their share of allies and traveling companions. These individuals too have either traveled with them or aided them in some sort of way.