R2-S4
this astromech droid served the Alliance as the co-pilot of a Y-Wing for many years, until the Y-Wing was flown by Pike Angeles. When Angeles became a field operative, R2-S4 went with him. Like most R2 units, R2-S4 was quite independent, and tended to wander off when bored. Angeles enhanced the droid's programming, giving it the ability to break into and control starship computers, especially Imperial freighters and transports.