Char's Deleted Affair: Portrait Of Young Comet
Ricardo Vega was one of Char Aznable's subordinates along with Apolly during the One Year War. He escaped to Axis along with Apolly after the end of the war. During his time at Axis Roberto displayed his excellent piloting skills when he overwhelmed Rakan Dahkaran's platoon during live training. He later served as a mobile suit captain during the Axis civil war. He later left Axis with Char and Apolly to join the AEUG under the pseudonym "Roberto".
Mobile Suit Zeta Gundam
One of a pair of veteran Rick Dias pilots who serve as Quattro Bajeena's wingmen. Roberto is a reliable team player, experienced enough to handle almost any combat situation, and perhaps slightly more serious and diligent than his wisecracking comrade Apolly.
Mobile Suit Zeta Gundam Viewer's Guide - by Mark Simmons