Rosii was a male Rodian stationed at a secret Galactic Alliance Security blockhouse on Coruscant, where psychotic Jedi Knights Valin Horn and Jysella Horn were being held in carbonite in 43 ABY. Rosii served alongside Galactic Alliance Security Sergeant Weeze, and both were present when a group of Jedi entered the facility with permission from Judge Arabelle Lorteli to visit the Horns. Rosii and Weeze denied that the psychotic Jedi were there, claiming that the facility was used simply for storage, but a Galactic Alliance Security assault team under the command of Captain Atar arrived on the scene. The Jedi presented the document to Atar, who was forced to allow them access to the Horns.