Thrush is an older wolf that found and raised Blizzard from puphood, acting as the younger wolf's guardian and teacher. The two were looking for a more permanent residence to avoid the stress of living as loners when they met Naenie. Both of them accepted the offer extended to them almost instantly. Thrush, being the more mature and experienced of the two, agreed to help out with hunting expeditions in whatever field he could.
Thrush likes to see the best in all wolves, and doesn't need to know someone for long to be able to call them his friend. He's not as naive as he used to be in his youth though, thanks to all of his life experience, but it's still not hard to take advantage of him.