1 | Ariadne | Oliver | The Celebrated Author / Hercule Poirot's Friend. |
| Maria | | Ariadne's Assistant. |
| Edwin | Aubyn | A Poet / Ariadne's Friend. |
| Wesley | Kent | Ariadne's Luncheon Companion. |
| Albertina | | Ariadne's Foreign Friend. |
| Maurine | Grant | Ariadne's Friend. |
| Nosey | Burton-Cox | An Avid Fan of Ariadne / Desmond's Adoptive Mother. |
| Celia | Ravenscroft | One of Ariadne's Godchildren / Daughter of the Victim. |
| Desmond | Burton-Cox | Celia's Fiancee / Mrs. Burton-Cox's Adoptive Child. |
| Margaret | Preston-Grey | Celia's Mother / Deceased. aka: Molly, Lady Ravenscroft. |
| Louise | | Ariadne's Friend. |
2 | Hercule | Poirot | Ariadne's Friend / The Famous Belgian Detective. |
| George | | Poirot's Manservant |
| Alistair | Ravenscroft | Celia's Father / Deceased. |
| | | Book 1 - The Elephants |
3 | Miss | Livingstone | Ariadne's New Secretary. |
| Miss | Sedgwick | Ariadne's Former Secretary. |
| Marianna J. | Pontarlier | Ariadne's Old Acquaitance. |
| Anna | Braceby | Ariadne's Old Acquaitance. |
4 | Edward | Ravenscroft | Celia's Brother. |
5 | Superintendent | Spence | A Retired Police Officer. |
| Chief Sup. | Garroway | Ravenscrofts Investigating officer / A Retired Police Officer. |
| Janet | Whittaker | The Cook-Housekeeper of Ravenscrofts. |
6 | Julia | Carstairs | An Old Acquaitance of Ravenscrofts. |
| Emma | | Julia's Servant. |
| Roddy | Foster | Julia's Cousin. |
7 | Mrs. | Matcham | A Former Nursemaid of the Ravenscrofts. |
| Gracei | Matcham | Mrs. Matcham's Sister. |
| Mrs. | Barnaby | Mrs. Matcham's Former Employer. |
8 | Elizabeth | Arden | A Benefit Provider. |
| Max | Factor | A Benefit Provider. |
| Helena | Rubenstein | A Benefit Provider. |
| Mrs. | Buckle | Former Cleaner of Ravenscrofts. |
| Marlen | Buckle | Mrs. Buckle's Daughter. |
| Emma | | Mrs. Buckle's Old Aunt. |
| Fred | Wizell | The Gardener of Ravenscrofts. |
| Mr. | Edmunds | Edward's Tutor. |
10 | Miss | Lemon | Poirot's Secretary. |
| Zellie | Meauhourat | A Governess of Ravenscrofts. |
| Mademoiselle | Rouselle | A Governess of Ravenscrofts. Aka : Maddy. |
| | | Book 2 - Long Shadows |
11 | Mrs. | Rosentelle | A Wig-Maker and Hair Stylist. |
| Dorothea | Preston-Grey | Margaret's Twin Sister. Aka : Dolly,Mrs Jarrow. |
| Captain | Jarrow | Dolly's Husband. |
12 | Barnet | | A Person who has a child killed in an accident. |
13 | Mademoiselle | Girand | The French Mistress. |
14 | Dr. | Willoughby | A Psychiatrist who specialized in twins. |
16 | Mr. | Goby | Poirot's Assistant Detective. |
| Cecil | Aldbury | Mrs. Burton-Cox's Former Husband. |
| Kathleen | Fenn | Cecil Mistress. |
| Major | Burton-Cox | Mrs. Burton-Cox's Husband. |