
My interpretation of the Inquisitors as Jedi!
Had this idea sitting around in my head for a while, so I wanted to try drawing what I think the inquisitors might have looked like when they were Jedi. I did Marrok and the Crow because of their recent relevance, and the Seventh Sister because awooga.
A lot of people liked my idea that the Crow might be a Kaleesh, even though he has plantigrade legs (which Kaleesh have been depicted as having from time to time, so I'm not too concerned). Given how human-centric the Empire is, I imagine he (and potentially other non-humanoid Inquisitors) is forced to cover up his inhuman traits; hence, why he wears a heavy double cloak and long mask that his tusks can tuck into. The mask attaches directly to the hood at the sides, allowing his ears and scales to be concealed. The eye placement suggests that his eyes are higher on his head than a human's, a trait the Kaleesh have, and his tall stature (I estimated 6'6" based on clips of him) may also indicate this. I'm not 100% certain of his height though; Marrok appears about as tall as Maul, who is now about 6' with his prosthetics, and the Crow is easily a head taller than Marrok.
Marrok is a very unique Force-user in that he often just throws hands rather than rely solely on his lightsaber. The Kage are famous for being experts in unarmed combat; that, combined with slight similarities in their armor, was enough for me to speculate he may be one. I imagine him being a little older than the other inquisitors given his extreme skill level (though we do not know how the Kage age) and he was likely a very powerful Jedi Master before being broken by the Empire. He is known to be a user of psychometry, meaning he can see and experience past memories and emotions tied to objects by touching them. I imagine this may have been difficult during the Clone Wars, given he could see the horrors committed throughout which many other Jedi were blind to, yet another reason he may have turned away from the Order. (Also note that the pointed shape of his helmet leaves a perfect space to store his Kage man bun...)
I get the feeling that the Seventh Sister may have been a sweetheart before being tortured by Vader, and she seems to wish she could have been a mother. I like to think she had a padawan that she cared deeply for, before losing them either to Order 66 or the Empire, and her psychopathy developed as a coping mechanism ("if I can break others under torture, it proves that I am not weak for doing the same"). She appears fairly skilled with a lightsaber, but is less adept in hand-to-hand combat, hinting at a gentler nature when she was a Jedi. I have a headcanon that her padawan may have been a Quarren, given the similarities between their head shape and her hair covering. I made her pink because... because.
Anyway, this is entirely my interpretation, and it was very fun to draw. A solid 70% of this is speculation. Please feel free to suggest other potential theories!