Celtic Shape-shifters are the oldest Wolf Shape-shifters in the world and were claimed to be different to the Quileute tribe cousins, they were believed to be a branch of the "Original Werewolf" Family that mastered their abilities to transform and thereby no longer needed to only transform into a bipedal Man-Wolf but also into a four legged wolf, they could control when they had their transformations and what form they transformed into - Human form, Werewolf form or Shape-shifter Wolf form.

It is unknown if they live still or if they all perished, two descendants however still remain, the Original Vampire-Supernatural Wolf Hybrids: Nevan and Kyan.