R4-X4 is an R4-series astromech droid and Phillip Stargazer's astromech during the Rebellion Era (0 BBY - 5 ABY). He is painted black with red trim, and has been upgraded with a laser beam, a mini grabber claw and various other tools. For a brief time, R4-X4 was playing a pretend role of an Imperial astromech after being sent onboard the Death Star II by Peridot Squadron. He now resides at the Peridot Squadron base on Kamino.