One who is in the process of application to become a Night-ChildIn a word, vampires. There are two branches of Night-Children, but both stem from Notte, as he was the first. More in Notte’s family. Only humans can be turned into vampires, and the human has to pass a series of tests and take a number of classes both before and after turning.
NotteHe’s one of the oldest living beings among the Mythos. The father of all vampires (or Night-Children, as they’re called),... More is pretty darned picky about who’s allowed to be turned.
As an aside, RavenaA vampire, and Notte’s oldest surviving child (not his first, however). More takes whomever she darned well pleases, but she has to keep them under the radar.