| | | | Part I: Letters |
| I | Mrs. | Saville | Recipient of the letter. |
| | | | St.
Petersburg, dated Dec1117. |
| | Margaret | Saville | Recipient of the letter. |
| | Thomas | | Margaret's uncle. |
| | Robert | Walton | Margaret's brother. Victor's friend. |
| II | | | Dated Mar2817. |
| | | | Part II: Story |
| 1 | Mr. | Beaufort | Alphonse's friend. |
| | Caroline | Beaufort | Mr. Beaufort's daughter. Alphonse's wife. Victor's mother. |
| | Elizabeth | Lavenza | Victor's love interest and cousin. |
| | Victor | Frankenstein | Narrator. |
| 2 | Henry | Clerval | Victor's friend. Son of the merchant in Geneva. |
| 3 | M. | Krempe | Victor's professor in Natural Philosophy. |
| | M. | Waldman | Krempe's co-professor. Victor's professor. |
| 6 | Ernest | | Victor's brother. |
| | Justine | Moritz | Frankenstein's favorite servant. |
| | Madame | Moritz | Justine's mother. |
| | William | Frankenstein | Victor's murdered brother. |
| | Louisa | Biron | William's wife. |
| | Miss | Manfield | Pretty girl in Geneva. |
| | John | Melbourne | Miss Manfield's fiance. |
| | Manon | | Miss Manfield's ugly sister. |
| | M. | Duvillard | Manon's husband. The rich banker. |
| | Louis | Manoir | Frankenstein's favorite schoolmate in Geneva. |
| | Madame | Taveneir | Louis's wife. |
| 7 | Alphonse | Frankenstein | Victor's father. |
| 10 | Daemon | | An imaginary man Victor met at the mountains. |
| 12 | De | Lacey | Blind old man. aka: The Old Man. |
| 13 | Agatha | | A young cottager. Lacey's friend. |
| | Felix | | A young cottager. |
| | Safie | | Felix's friend. A beautiful Arabian. |
| 20 | Mr. | Kirwin | A magistrate. |
| | Daniel | Nugent | Mr. Kirwin's brother-in-law. |
