Gray Jedi are those who, though having completed the teachings of the Jedi, operate independently and outside of the Jedi Council. They are typically seen as misguided, though they have not necessarily succumbed to the dark side.
Cade Skywalker, a descendent of Anakin and Luke Skywalker, constantly drew from the light and dark sides of the force, however, he was never corrupted by the dark side.
I almost put that until you did lol
W00t for being first!