| Drowned |
Abbey | A dangerous, ephemeral, flooded location within the Moors. |
| Michel |
Bleak | Mad scientist. Aka: Dr. Michel Bleak. |
| Alexis |
Chopper | A sweet, young human girl living in the Moors. |
| Mr. |
Chopper | Alexis's father. |
| Ms. |
Chopper | Alexis's mother. |
| Drowned |
Gods | Ancient, eldritch entities inhabiting the Moors. |
| Stephen |
King | American author. |
| Ira |
Levin | American novelist, playwright, and songwriter. |
| The |
Master | A powerful, ominous vampire. |
| The |
Moors | A gothic, dangerous, perpetually twilight-shaded world accessed by Jack and Jill. |
| Dr. |
Tozer | Serena's doctor. |
| Chester |
Wolcott | Serena's husband. |
| Louise |
Wolcott | Chester's mother; paternal grandmother of Jack and Jill. Aka: Gemma Lou. |
| Serena |
Wolcott | Mother of the twin protagonists. |
| John |
Wyndham | English fiction writer. |
| Alice |
| A child who found a door to another world. |
| Bela |
| Deceased former resident of the Moors. |
| Brooke |
| Jacqueline's friend. |
| Dorothy |
| Child who found a magical, nonsensical world. |
| Eurydice |
| Nymph from Greek mythology. |
| Ivan |
| The master's acquaintance. |
| Jacqueline |
| One of Chester and Serena's daughters. Aka: Jack. |
| Jillian |
| Jacqueline's twin sister. Aka: Jill. |
| Mary |
| The maid. |
| Peter |
| Fairy-tale figure representing children who stray from the path. |
