Starclan

StarClan are the deceased warrior ancestors of the Clans who live on in spirit form after dying, and watch over the living Clan cats. There is no specific leader for StarClan, since there are many cats from all four Clans that work together. They are responsible for sending signs and omens to the living cats.

Thunderclan

ThunderClan is the Clan of origin for many of the protagonists of the arcs. ThunderClan cats are known for their skill at stalking prey through forest and undergrowth. The very first leader was Thunder. ThunderClan was led by Bluestar in the beginning of the series, and is currently led by Bramblestar with Squirrelflight as deputy.

Shadowclan

ShadowClan, the source of many of the darker cats seen in the series, is sometimes referred to as the "dark heart of the forest." ShadowClan cats are known for their ability to walk quietly and avoid detection. They're also known for their willingness to eat frogs, toads, lizards, rats, and crowfood- foods most Clan cats turn their noses up at. Their first leader was Shadow. At the beginning of the series, ShadowClan was led by Brokenstar, though it is currently led by Blackstar, with Rowanclaw as deputy.

Riverclan

RiverClan is known for their skill at swimming. RiverClan cats are also known for their unique skill at scooping fish from the river. The very first leader was River. At the beginning of the Original Arc, RiverClan is led by Crookedstar. RiverClan is currently led by Mistystar with Reedwhisker as deputy.

Windclan

WindClan, who lived closest to the Moonstone, are cats well versed in Twoleg culture (due to the farm they lived so close to). WindClan Cats are known for their swift paws, which lend ease to catching prey such as rabbits on the open moors of their territory. Their very first leader was Wind. WindClan's leader in the beginning of the series was Tallstar, and is now currently led by Onestar, with Ashfoot. as his deputy.

Skyclan

SkyClan was the fifth Clan of the Forest, and they were introduced in Firestar's Quest. They had to leave the Forest a long time ago when their territory was destroyed, which severed their ties with the other Clans. They were known for their ability to jump considerable heights, and they have hard gray pads that help them walk long distances on rough surfaces. Their first leader was Sky. SkyClan is currently led by Leafstar, with Sharpclaw as her deputy.

Bloodclan

BloodClan is an unofficial Clan. Its only known members are Scourge, Ice, Snake, Bone, Jaggedtooth, and Brick. Boulder, Snipe, Barley, and Violet were known members but left BloodClan. The Clan laws differ compared to the official Clans. They do not believe in StarClan. BloodClan does not care for the sick, weak, or elderly and instead throws them out on the borders and makes them fend for themselves. They eat anything they find. The last known leaders are Ice and Snake.

The Gathering

A Gathering is a meeting of the Clans, and is held on the night of a full moon. As said in the Warrior Code, there is a truce, which forbids fighting during the Gathering. It is considered a great honor to be chosen by a Clan leader to go to a Gathering. In the the forest, this meeting was held at Fourtrees, while at the lake, this place has been moved to the island