| 1 | Margery | Benson | Protagonist. An insect collector. Aka: Miss Benson. |
| | Tobias | Benson | A reverend. Margery's father. |
| 2 | Wendy | Thompson | One of Miss Benson's students. |
| 3 | Horace | Blake | The map illustrator. The reverend. |
| | Enid | Pretty | One of Margery's applicants. |
| | Charles | Darwin | A naturalist. |
| | Alfred | Russell Wallace | Charles Darwin's friend. |
| 4 | Hazel | | Margery's aunt. Tobias's sister. |
| | Lorna | | Margery's aunt. Hazel's twin sister. |
| | Barbara | | Hazel and Lorna's maid. |
| 5 | Miss | Hamilton | Miss Benson's assistant. |
| 7 | Norman | Skinner | A murderer. |
| 8 | Taylor | | The man who joined Margery's table. |
| 10 | Perce | Pretty | Enid's husband. |
| 13 | Archibald | Benson | Miss Benson's brother. |
| | Hugh | Benson | Miss Benson's brother. |
| | Howard | Benson | Miss Benson's brother. |
| | Matthew | Benson | Miss Benson's brother. |
| | Howard | Carter | An Archaeologist and Egyptologist. |
| 14 | Bill | Sikes | A fictional character. |
| 16 | Mrs. | Clark | The neighbor who came to the police. |
| | Mr. | Clark | Mrs. Clarks's husband. |
| | Nancy | Collett | Missing. The woman who killed her husband. |
| 17 | Professor | Smith | The man Margery falls in love with. Margery's boss. |
| 18 | Captain | Cook | The discoverer of New Caledonia. |
| | Napoleon | | A French military and political leader. |
| 19 | Mr. | Rawlings | The dog. |
| 21 | Victoria | Pope | The consul's wife. |
| | Dolly | Wiggs | Miss Benson's new companion. Mrs. Pope's right hand woman. |
| | Peter | Wiggs | Dolly Wigg's husband. |
| 22 | Percival | Collett | Nancy's husband. Murdered. |
| 26 | Xavier | Montrouzier | An entomologist. |
| | Emile | Deplanche | An entomologist who lived on the island from 1853 to 1897. |
