D6-L, also known as Dee-six, was an R-series astromech droid in service to the New Republic. Yrica Quell, an Imperial who defected, selected this droid to be her co-pilot in her T-65B X-wing starfighter while serving in Alphabet Squadron. Following the unsuccessful Mission to Abednedo, D6-L volunteered to leave, taking responsibility for the incident when Quell's starfighter couldn't execute an unrealistic maneuver to safeguard a freighter transporting captured Imperials. During Alphabet Squadron's attack of Pandem Nai, D6-L met its end.