Ninth Sister

The Ninth Sister, formerly known as Masana Tide, was a female Dowutin who served as an Inquisitor during the early stages of the Galactic Empire's reign. She accompanied Darth Vader, the Sixth Brother, and the Tenth Brother to the planet Mon Cala to hunt an enemy of the Empire.

Background
A force-sensitive female Dowutin served as an Inquisitor in 19 BBY. She originally had ties with the Jedi Order before falling to the Dark Side. Shortly after the Empire began its reign, she joined the Inquisitorius program under Darth Sidious and Darth Vader. In the Inquisitorius program, she trained with the Fifth Brother, the Sixth Brother, the Seventh Sister, the Eighth Brother, and the Grand Inquisitor. She trained at the Works on Coruscant.

During her training with Darth Vader shortly after the dark lord learned about the Inquisitorius, she suffered severe injuries and had to be tended to by a 2-1B Surgical Droid.

Mission to Cabarria
Later, she accompanied Darth Vader on a mission to Cabaria in the Colonies Region. Vader ordered her to wait outside the bar he was going into while he investigated inside for a family of bounty hunters unless he called her. The bounty hunters had taken a bounty on Vader and soon enough, Vader had had his lightsaber destroyed, only having the crystal surviving. He ordered the Ninth Sister to bring him her lightsaber but she ignored it, staying outside.

When Vader left the bar, the Inquisitor was being held at gunpoint by Ramat Cha, who had acquired and started up a speeder. The family, however escaped, leaving the Ninth Sister there. As Vader walked out of what was left of the bar, he accused her of trying to get him killed to which she denied. She also told him that she did not place the bounty upon his head, saying that maybe one of the other Inquisitors had done so. He then told her to wait there and that if she fled, he would kill her.

Back to Coruscant
Later, she accompanied Darth Vader back to Coruscant. When they tried to transit their clearance codes to land, they discovered their transmitter was jammed. A missile platform then fired on them which Darth Vader was able to evade all but one with his piloting skills. The one that hit the caused them to crash land on Coruscant.

Mon Cala
In 18 BBY, the Ninth Sister went to Mon Cala with the Sixth Brother, Darth Vader, and another unidentified Inquisitor. She showed Commander Ackbar the jurisdiction for her and her landing party to investigate the planet for a Jedi. Behind them, Ambassador Telvar's shuttle exploded with him in it, giving them more reason to investigate.