Adin is an Ilari loyal to the body-hopping tyrant Tieran, who comes aboard Voyager with him and Nori and then helps the possessed Kes seize power on Ilari in Warlord.
Adin appears in the third-season episode Warlord. He is one of three Ilari beamed off a failing ship, along with the dying Tieran and Tieran's wife Nori. In sickbay Tieran secretly transfers his mind into Kes, and Adin and Nori are the only ones who know who is now looking out through her eyes.
Adin goes with them when Kes steals a shuttle, killing a crewman on the way out, and stands at her side during the coup in which the Autarch is murdered and Tieran takes the throne he lost two centuries earlier.
He is a soldier and follower, devoted to the cause, but he and Nori grow uneasy as Kes's mind fights back and their leader becomes erratic. The regime falls when Voyager and the Autarch's son Demmas storm the palace and Tieran is destroyed.