The Third Sister

Under the Grand Inquisitor, each Inquisitor is given a number followed by a sibling identifier. We don’t know how the numbers are decided upon, but we know we’ll meet at least two in Obi-Wan Kenobi.
First up, and most importantly, is the Third Sister, played by Moses Ingram. This is the first time we’re meeting this character, also called Reva, in Star Wars, and she is a formidable, lightsaber-wielding force.