Seeming and Kith

The Lost bear Seemings and Kiths as scars of their Durance in Arcadia. Their stay in the domains of the True Fae has forever changed them. Each group is definied by specific traits: Beasts are those with animalistic traits, Darklings are defined by their affinity for all things dark and mysterious, Elementals manifest the powers of the very elements of nature, Fairest are those touched by the very essence of beauty and cruelty of Arcadia, Ogres were twisted beyond recognition from beatings and savagery, and the Wizened have grown bent and broken under the labours they were made to perform for their masters.
Each of the Seemings are in turn divided into further subgroups, Kiths, that define them even more. There are also those who are Kithless; whose stay in Arcadia did not mold them into fitting any of the categories below, but instead remain somewhat of a blank slate.
Each Seeming has a Blessing and a Curse associated with it. Each Kith, too, comes with its additional Blessing.
For explanations on what the acronyms under Source Book stands for, see Source Books.