I would bet the Inquistors died off a long time before that. They were Vader's thing. Don't think Filoni is going to crap on one of his elements he used in Rebels. From what Vader expected from in the commits, I don't they would have survived his wrath if any were still alive after Rebels.
I hope it's a new character but it could also be Sabine. She always looked SE Asian/Island Pacific to me.