Classes are the overarching system that encapsulates groups of races. The Fairy Garden currently consists of four classes balanced somewhere between Nature and Darkness. These classes include Elemental, Furry, Lepidran, and Undead, in order of alliance to Nature.
The two middle classes, Furry and Lepidran, are more bestial races, one being mammalian and furred, and the other being lizard-like. Though members of these classes can choose to which faction they will belong, they do trend toward either Nature or Darkness, respectively.
The remaining two: Elemental and Undead are completely aligned with Nature and Darkness respectively, and thus do not have this choice.