- "I will burn that out of you until all that's left its charred and black. A hot coal gone cold."
- ―Sinjir endured harsh training under the tutelage of ISB Officer Sid Uddra
Sid Uddra was a female human who served as officer in the Imperial Security Bureau and trainer of Sinjir Rath Velus at the Imperial Academy. Uddra was a native of Sixmoon in the Velusia system. During Sinjir's adolescence, he attended an Imperial Academy. Due to his high intelligence and anger issues, Sinjir was picked by Uddra for training as an Imperial loyalty officer. Sinjir was transferred to the ISB's training program at the Viper's Nest on the ocean world of Virkoi. Under Uddra's tutelage, Sinjir underwent a harsh and violent training program which involved frequent physical combat and stimulated torture sessions. On one occasion, Uddra even broke his toes in order to toughen him up.
Sinjir's first assignment as a loyalty officer was to spy on the Imperial Navy Lieutenant Alster Grove, who was part of a cabal seeking to overthrow Emperor Palpatine by assassinating Darth Vader. Uddra assigned him with rooting out the names of the other conspirators. Under Uddra's direction, Sinjir tortured Grove for two nights until the man yielded the names of his fellow conspirators. Uddra personally executed Grove by throwing him into the oceans of Virkoi while Vader hunted down and beheaded Grove's co-conspirators.
- Aftermath: Empire's End (First appearance) (Appears in flashback(s))