Straw Hat Pirates/Allies

Straw-Heart Alliance
An alliance between The Straw Hat Pirates and Heart Pirates formed on Punk Hazard by the two groups captains in order to defeated Kaido, one of the four Yonko of the New World. According to Law, who propose the alliance, their cooperation would give them a 30% chance to beat the yonko. The plan was to take down Kaido source of SMILE delivered by Doflamingo and weakened him, while letting Doflamingo take on Kaido's anger. However, the events on Dressrosa made Law be concern of Kaido reaction. The alliance eventually would grow to became the "Ninja-Pirates-Mink Alliance" on Zou.

Ninja-Pirate-Mink Alliance
An alliance of the Kozuki Family retainers with the Straw-Heart Alliance formed on Zou in response to Momonosuke request for the pirates help in revenge against The Beasts Pirates and the shogun of Wano Country for the murder of his parents and the release of Wano from their control.

Individuals
Throughout the series there have been people who have either traveled with one or all of 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 are:


 * Vivi and Carue, as they traveled with the crew for almost the entire Alabasta Saga, and even considered permanently joining them but due to her promise it seems that she is always welcome back.


 * Jinbe, who was invited to join the crew, but declined due to unfinished business. He promised that once his business is concluded, he will return to the Straw Hats, and join them if they still want him.
 * Trafalgar D. Water Law, who has formed an alliance with Luffy to take down the Yonko Kaido. Law has traveled with the Straw Hats since they left Punk Hazard

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.

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.

Game Only
In a few video games, the Straw Hats have gained new allies who help them through the course of their games. They have either traveled with them or assisted them in some sort of way.