Reva Sevander, designated the Third Sister, is a human Inquisitor in the Disney+ series Obi-Wan Kenobi (2022), played by Moses Ingram. She was a youngling in the Jedi Temple during Order 66 and survived by playing dead among the bodies.
An infiltrator, not a convert
The series' central reveal is that Reva never fell. She joined the Inquisitorius as a route to Darth Vader, and every act of cruelty along the way is a credential she is buying. It reframes her entire performance on a second viewing, and it is a genuinely different answer to the question of why anyone would take that job.
The cost of the plan
What the series is careful about is that the plan does not excuse anything. Reva hunts real fugitives and hurts real people to maintain her position, and when she finally reaches Vader he beats her without difficulty and tells her she has been useful. The revenge does not work, and the story's actual question becomes whether she can stop.
Tatooine
Her arc ends with her standing over a child on Tatooine with a lightsaber, choosing not to become the thing she has been imitating. Whether the series earned that turn is one of the more contested points about it; what is not in doubt is that Ingram plays the moment as a decision rather than a redemption.
Canon status
Canon, created for the 2022 series. She and Trilla Suduri are the two human Inquisitors depicted so far.