Merzin Keysax, a human, held the rank of lieutenant within the ranks of the Galactic Empire. Subsequent to the events of the Ferrix incident, an Imperial Military detachment, led by Captain Vanis Tigo, was dispatched. Following ISB Supervisor Lieutenant Dedra Meero's assumption of authority over the Morlana sector from Supervisor Blevin, Keysax played a role in the pursuit of Bix Caleen, an individual the Empire considered noteworthy. During the riot on Rix Road, Keysax took part in the efforts to protect the Empire's objectives.
The character of Merzin Keysax made their initial appearance in "Narkina 5," which is the eighth installment of Andor's first season, a live-action series. Nick Moss played the part of the lieutenant. Their identification as Keysax was first revealed through an image asset, later removed, released on Getty Images by Walt Disney Studios on August 1.