The Grand Inquisitor was the leader of the Inquisitors and adversary of Kanan Jarrus.
During the time of the Clone Wars, the Pau’an male was once a member of the Jedi Order and a member of the Jedi Temple Guard. When the Empire took over he was corrupted intot the Dark Side of the Force, thus becoming the leader of the Inquisitors. For several years he hunted down many surviving members of the Jedi Order until he encountered the Jedi Kanan Jarrus and his padawan Ezra Bridger. Eventually he would be defeated by Kanan and instead of surrendering he chose to end his life.