| Type: | cameo |
| Age Range: | 7 – 14 |
| Gender: | male |
| Voice Part: | spoken |
| Vocal Range: | none |
| Dancing: | N/A |
| Name | Gender | Vocal Part | Age Range | Role Type |
| Charles Guiteau | male | tenor | 35 – 45 | supporting |
| David Herold | male | spoken | 20 – 30 | supporting |
| Emma Goldman | female | spoken | 35 – 65 | cameo |
| Gerald Ford | male | spoken | 40 – 65 | cameo |
| Giuseppe Zangara | male | tenor | 28 – 36 | supporting |
| James Garfield | male | spoken | 40 – 60 | cameo |
| John Hinckley | male | baritone | 18 – 25 | supporting |
| John Wilkes Booth | male | baritone | 25 – 37 | supporting |
| Lee Harvey Oswald | male | spoken | 20 – 35 | supporting |
| Leon Czolgosz | male | bass | 28 – 36 | supporting |
| Lynette "Squeaky" Fromme | female | mezzo | 18 – 35 | supporting |
| Samuel Byck | male | spoken | 35 – 50 | supporting |
| Sara Jane Moore | female | soprano | 25 – 45 | supporting |
| The Balladeer | male | tenor | 30 – 60 | supporting |
| The Proprietor | male | tenor | 30 – 55 | supporting |