Marvel is doing it, right? There are several amazing brotherly team-ups in world folklore and mythology, but not so much on the female side.
But, fear not! I managed to rustle up a few.
The Nakhi creation tale
This matrilinear minority from China tells a story about an evil serpent, and four women - Wisdom, Doer, Thinker, and Seer - who made a plan, tricked it, and destroyed it so people could live in peace. Talk about an epic teamup.
(Read in in Tales from Within the Clouds)
I already mentioned this Miao folktale in my post about elder and middle siblings, but I am mentioning it again because it features four girls defeating seven wolves together.
(Read it in Seven sisters)
The water-splashing festival
(Chinese minorities seem to be the theme of the day)
In this story, twelve women are kidnapped by a demon who is seemingly invincible. The smartest girl coaxes his secret weakness out of him, and kills him, but the head of the demon cannot be put or buried anywhere without causing destruction. Because of it, the twelve wives take turns carrying the head to keep it from hurting anyone, until the curse is broken. People splash water on them to help clean off the blood - a rite that is reenacted every year.
(Read the story in South of the Clouds)
How the women saved Guam
In this Pacific legend a giant fish is devouring islands and no one is able to stop it. Men don't allow women to help them hunt it, claiming they know nothing - but they themselves fail at stopping the threat. Finally the women get together, make a plan, weave a net from their own hair, and manage to capture the beast and save their homes.
(Read it in Pacific island legends)
The army of women
The Ossetian Nart sagas are regarded as close relations to the Greek Amazon myths. In one of the sagas, the Nart village is attacked while the men are away on a raid, and the Nart women put on armor and weaponry and ride out to defend their homes together.
(The Ossetian Nart sagas will be published in English for the first time this July!)
Gulaim and her warrior maidens
I wrote about her last year for Epics A to Z. Instead of getting married at the age of fifteen, Gulaim gets her own fortress, and forty like-minded girls that she trains in the martial arts. They end up saving their homeland from an invasion, defeating the leader of the enemy, and liberating another kingdom as well in the process.
(Read about the epic here)
The Rebel Princess
In this amazing Jewish folktale, the persecuted heroine recruits a crew of clever maidens, steals a ship from pirates, and goes on to become a queen by her own right until her lost fiance finds her again.
(Read the story in The serpent slayer)
The Giant Caterpillar
(Adding this one by Sharon's recommendation in the comments. Thanks!)
In this folktale from the Ivory Coast, a giant caterpillar swallows an impertinent boy. After the men of the village fail to save him (and run away), the women go out together to beat the monster to death and rescue the boy.
(Read the story in this book)
Are there any other girl hero teams I should add to the list? Let me know in the comments!