| Neil | Armstrong | American astronaut. |
| Tom | Atkins | The law enforcer professional. |
| Ella | Belle | The committee psychic. |
| Nicola | Berry | The Earthling Ambassador. |
| Tyler | Brown | One of Nicola's best friends. |
| Bruno | Ecclestson | One of Nicola's classmates. |
| Pamela | George | One of the planet's most reputable color experts. |
| Georgio | Gorgiosko | The president of the Save The Little Earthlings Committee. |
| Mrs. | Gray | A Math teacher. |
| Greta | Gretch | Nicola's worst enemy. |
| Katie | Hobbs | One of Nicola's best friends. |
| Sarah | McCabe | One of Nicola's classmates. |
| Mr. | Nix | The school principal. |
| Mr. | Puck | A pet ship manager. |
| Rory | Racrory | The Globagaskar's leading letterologist. |
| Lizbeth-Ann | Roberts | One of Nicola's classmates. |
| Molly | Smith | A plump, freckled lady with red curly hair. |
| Mrs. | Zucchini | Nicola's teacher. |
| Mrs. | Zukker | Mrs. Zucchni's real name. |
| Annie | | Nicola's great-aunt. |
| Ardy | | Nicola's new acquaintance. |
| Bev | | Greta's aunt. |
| Ellie | | Nicola's cousin. |
| Goldie | | Nicola's pet fish. |
| Ileria | | A highly respected astrologer. |
| Mully | | Georgio's wife. |
| Plum | | A pilot. |
| Princess Petronella | | The King and Queen of Globagaskar's young daughter. aka: Nelly. |
| Sam | | Nicola's cousin. |
| Sean | | Nicola's brother. |
| Shimlara | | Georgio's daughter. |
| Squid | | Georgio's son. |
