Born Katherine Aelwen Lin. For the record, she rarely allows “Kate.”
Merlin’s niece, she currently lives somewhere in America, having fled her home in Wales. She’s actually a lot more powerful than she thinks she is, but she can’t afford to acknowledge it.
It’s a terrible but true fact that Kin, for the most part, refers to human wizards - that is, humans with something else in them allowing them to do magic. However, the Kin are really any magical beings with mixed blood. This can be human and Seelie fey, Shadow's Breath and Phoenix, Wulver and Rusalka - absolutely anything. Beings fall into this category if they do not clearly favor... – having been already “diluted” from their magical ancestry – can be extremely preferential and picky about breeding. Katie does everything she can to stay under that breeding radar, which is one of the reasons she ran.
In general circles (and with some humor), she is called “the Lost Lin,” thanks to an incident involving prophecies, a broken wall, and spilled time.