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This article contains plot details from the latest books.
The Black Swan's Collective consists of its five leaders, Mr. Forkle, Blur, Granite, Wraith, and Squall. The Collective makes the big decisions for the Black Swan. It was mentioned by Mr. Forkle that it is ultimately their plan for Sophie and her original group of friends to take their places, eventually. They, like the Councillors, cannot have kids or a family, but that rule has been broken for Squall and Granite.
It is revealed in Nightfall that Mr. Forkle had a twin brother that went by the same name. Sometimes Sophie was in the company of one, and sometimes with the other. Unfortunately, one of the brothers died at the end of Lodestar, and now Mr. Forkle can't be in multiple places at one time anymore.
Mr. Forkle- aka Magnate Leto, Sr. Astin, and a Fertility Doctor: (one of the twins is deceased) is the leader of the Collective and was the head of Project Moonlark. He is a very talented Telepath, who is one of the few Telepaths to breach Sophie's blocking. He disguises himself by consuming ruckleberries, causing him to appear as an old man.
Granite-aka Tiergan: is a very powerful telepath, and is Wylie's legal guardian. He frequently assists Sophie and Fitz on their path to being Cognates. His disguise consists of turning himself into a stone statue.
Physic-aka Livvy: (previously) is a previous Collective member who wears decorative masks to disguise herself. She stepped down after Sophie's allergic reaction. Her ability remains unknown. It is known however, that she is not a Flasher, like Elwin, or else this would make her job easier.