To answer u/Mpetey123 some of them did know who Vader really was.
Malorum [later the first Grand Inquisitor] initially worked as an Imperial Intelligence operative, and along with Director Armand Isard, visited the Jedi Temple in the aftermath of Order 66. There, he saw a hologram of Emperor Palpatine addressing Anakin Skywalker as Lord Vader. Thus, Malorum was one of a few in the Empire—along with Prince Xizor, two decades later—who knew Vader's true identity, although Vader and Palpatine were unaware of this fact.
Following the incident, Malorum was plucked out of obscurity by Palpatine, who revealed that he was a Sith and placed Malorum in charge of the Inquisitorius
The Inquisitors existed in the EU. They were actually mentioned in the radio drama which was fully approved by George Lucas which would make them top level canon at the time.
The inquisitors didn't exist until disney.
https://starwars.fandom.com/wiki/Jerec_(Inquisitor)
https://starwars.fandom.com/wiki/Inquisitorius/Legends
there were definitely inquisitors in the old eu, vader can't be everywhere at once.
Nope. They were introduced by Disney.
The closest thing were the emperors hands. And I don't think most, if any, of them would have known.
In the Force Unleashed DLC, Starkiller becomes an inquisitor. It's all "what if" stuff but it was pre-Disney before LucasArts was dismantled.
Inquisitors were definitely in the EU, the most prominent probably being the villain of 'The Crystal Star'.
The Inquisitors existed in the EU. They were actually mentioned in the radio drama which was fully approved by George Lucas which would make them top level canon at the time.