One of his signature roles was David from Die Meistersinger von Nürnberg, which is confirmed by the number of times he recorded the role, including with Herbert von Karajan (1951), Rudolf Kempe (1951 and 1956), Hans Knappertsbusch (1952), Hans Rosbaud (1955), and Rafael Kubelík (1968).
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Unger's other Salzburg Festival roles included Monostatos in two different stagings of The Magic Flute (1967, 1968 and 1970, staged by Oscar Fritz Schuh and conducted by Wolfgang Sawallisch; 1974 staged by Strehler and conducted by Karajan, and Valzacchi in Richard Strauss' Der Rosenkavalier (1969, staged by Rudolf Hartmann, designed by Teo Otto, and conducted by Karl Böhm).
Gerhard Schröder | Gerhard Richter | Gerhard Müller (rower) | Gerhard Müller | Gerhard von Scharnhorst | Gerhard Munthe | Felix Unger | Jonathan Unger | Gerhard Zucker | Gerhard | Gerhard Markson | Gerhard Gentzen | Unger, West Virginia | Unger | Roberto Gerhard | Herman Gerhard Gade | Gerhard von Rad | Gerhard V of Jülich | Gerhard Riedmann | Gerhard Präsent | Gerhard Munthe (painter) | Gerhard Maria Wagner | Gerhard Ludwig Müller | Gerhard Heinrich Dieke | Gerhard Hanappi | Gerhard Frey | Gerhard Christoph von Krogh | Garry Unger | Caroline Unger | Billy Unger |