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.
A Gray Jedi during the Old Republic era, he traveled with the amnesiac Revan in the search for the Star Forge. He made use of dark and light side powers, such as the Jedi mind-trick and the Sith lightning.
Counciler right?
Yeah.
EDIT: Stupid reply button.