The cast is listed in the Paris libretto (Scribe 1833) and Tamvaco 2000, p. 89, except for the silent roles of Roslin and Sergell, which are listed in the Amsterdam libretto (Scribe 1835, p. 8). The cast is also listed, with some minor differences, in Casaglia 2005. Scribe, Eugène (1833). Gustave III, ou Le bal masqué (libretto). Paris: Librairie de l'Académie Royale de Musique. Tamvaco, Jean-Louis (2000). Les Cancans de l'Opéra. Chroniques de l'Académie Royale de Musique et du théâtre, à Paris sous les deux restorations (2 volumes) (in French). Paris: CNRS Éditions. ISBN9782271056856. Scribe, Eugène (1835). Gustave III, ou Le bal masqué (libretto for a performance in Amsterdam on 3 September 1835). Amsterdam: A. J. van Tetroode.
The role names of the Ministers of Justice and War are given in the libretto text, e.g., Scribe 1833, p. 4. Scribe, Eugène (1833). Gustave III, ou Le bal masqué (libretto). Paris: Librairie de l'Académie Royale de Musique.
Identified as Jean Tobie Sergell by Scribe 1833, p. 3 (footnote) Scribe, Eugène (1833). Gustave III, ou Le bal masqué (libretto). Paris: Librairie de l'Académie Royale de Musique.