A Familiar Spirit is a collectible energy creature found only in Rayman Revolution. They are small, blue, glowing lights that have been imprisoned in cages by the Robo-Pirates. As Murfy says when Rayman destroys the first cage in the game, the Familiar Spirits are friends of the fairies. Each time ten Familiar Spirits are set free, Ly's head appears in the game's heads-up display, meaning that she can now open a new Spiral Door which will lead Rayman to a new minigame. In order to access these eight minigames, Rayman must meet with Ly at one of three special locations: Ly's House, Ly's Stele and Ly's Cave. There are a total of eight Familiar Spirits to be freed throughout the game.

A Familiar Spirit, as seen on Rayman Revolution's pause menu

There are some parallels between the Familiar Spirits in Rayman Revolution and the Tings in the original Rayman game. Both are sparkling, blue, floating collectibles, and while Ly the Fairy lets Rayman access a minigame in exchange for ten Familiar Spirits, the Magician lets him access a minigame in exchange for ten Tings.