Familiar Spirit
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A Familiar Spirit is a collectable in Rayman Revolution. They are small blue lights that are trapped in cages, and are used to unlock bonus minigames via any of the three places where Ly the Fairy can be found. For every ten that are set free, Ly's head appears in the game's heads-up display, meaning that she can open a new Spiral Door. As Murfy says after destroying the first cage in the game, the Familiar Spirits are friends of the fairies.
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.