Straw Hat Pirates/Allies

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. Along with those individuals, there has also been various groups that have assisted the Straw Hats in their adventures. These groups have helped the Straw Hats either to reach a certain goal or to defeat a common enemy.

Straw Hats-Franky Family-Galley-La Alliance
An alliance formed on the way to Enies Lobby on a mission to rescue Nico Robin and Franky from the World Government and CP9 and to avenge the assassination attempt on Iceburg. The majority of the help occurred on the courtyard and courthouse in order to help The Straw Hats reach the Tower of Justice and face the CP9 agents with the Franky Family entrusting the rescue of their leader to the Straw Hats. The allies went their separate ways when The Straw Hats continued on their journey with Franky as their new Shipwright and the Franky Family started working for Iceburg and Galley-La Company.

Straw Hat-Heart Alliance
An alliance between The Straw Hat Pirates and Heart Pirates formed on Punk Hazard by the two groups captains in order to defeat 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 Hat-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
Among those, there are more notable persons:


 * 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
Among those, there are more notable groups:
 * The Whitebeard Pirates and their allies, who despite only allied themselves with Monkey D. Luffy in Marineford due to the order of the captain, continue to protect him saying that they will fulfill their father final order.
 * The Heart Pirates who formed the first pirate alliance with The Straw Hats.
 * The Straw Hat Grand Fleet who increase The Straw Hats power and reputation in the New World.