I think I had the most fun doing Thumos because of the process. As part of my hobbies, I like taking screenshots of enemies, and it was there that I realized Thumos was an absolute monster. His AI would've been perfect had it not been for his low health. Anyway, here are the other Red Legion Centurions.

(minor - elite - major - Bloodguard)
Generic
Specialized (Valus Thuun, Warden)
Imperial Deserter

EDIT 2/26/22 - Added the Imperial Deserter

UPDATE 6/12/22 - Fixed gray color for all basic Centurion variants

UPDATE 6/21/22 - Fixed "gold" color for minor Centurion

UPDATE 6/21/22-2 - Fixed gauntlet shading on Thumos

UPDATE 6/25/22 - Fixed foot armor on all variants

UPDATE 7/8/22 - Filled out foot armor for all variants

UPDATE 3/21/23 - Fixed belt on all variants

UPDATE 6/1/23 - Added generic variant