| 1 | Nicola | Berry | The Earthling Ambassador. |
| | Mrs. | Zucchini | Nicola's teacher. |
| | Mrs. | Zukker | Mrs. Zucchni's real name. |
| | Sean | | Nicola's brother. |
| | Greta | Gretch | Nicola's worst enemy. |
| | Tyler | Brown | One of Nicola's best friends. |
| | Katie | Hobbs | One of Nicola's best friends. |
| 2 | Mr. | Nix | The school principal. |
| | Georgio | Gorgiosko | The president of the Save The Little Earthlings Committee. |
| | Lizbeth-Ann | Roberts | One of Nicola's classmates. |
| 3 | Bruno | Ecclestson | One of Nicola's classmates. |
| | Goldie | | Nicola's pet fish. |
| | Sarah | McCabe | One of Nicola's classmates. |
| 5 | Plum | | A pilot. |
| 6 | Ellie | | Nicola's cousin. |
| | Princess Petronella | | The King and Queen of Globagaskar's young daughter. aka: Nelly. |
| 7 | Annie | | Nicola's great-aunt. |
| 8 | Neil | Armstrong | American astronaut. |
| 9 | Rory | Racrory | The Globagaskar's leading letterologist. |
| | Molly | Smith | A plump, freckled lady with red curly hair. |
| | Ileria | | A highly respected astrologer. |
| | Tom | Atkins | The law enforcer professional. |
| | Pamela | George | One of the planet's most reputable color experts. |
| | Ella | Belle | The committee psychic. |
| | Mr. | Puck | A pet ship manager. |
| 10 | Squid | | Georgio's son. |
| | Mully | | Georgio's wife. |
| | Shimlara | | Georgio's daughter. |
| | Sam | | Nicola's cousin. |
| 13 | Mrs. | Gray | A Math teacher. |
| | Ardy | | Nicola's new acquaintance. |
| 35 | Bev | | Greta's aunt. |
