| Laura | Birch | H.G. Kane's classmate and first murder. AKA: Liza. |
| Ms. | Bristol | Harry's teacher. |
| Mr. | Carlson | Harry's algebra teacher. |
| Shelby | Carpener | Emma and Shawn's daughter. |
| Emma | Carpenter | Protagonist. |
| Shawn | Carpenter | Emma's husband. |
| Alexis | Cowl | Deek's daughter. |
| Annie | Cowl | Deek's daughter. |
| Deacon | Cowl | A Dallas-based journalist. |
| Demon | Face | The stranger. |
| Eric | Grayson | A police officer. AKA: Old Cop. |
| Greg | Hall | Grayson's colleague. AKA: Young Cop. |
| H.G | Kane | The author of Murder Mountain. AKA: Howard Grosvenor Kline. |
| Jules | Phelps | The house's owner. Emma's boss. |
| Jake | Stanford | One of the victims. |
| Crystal | | Emma's co-worker. |
| Deek | | Emma's neighbor. |
| Harry | | The protagonist on the book. AKA: Propeller Head. |
| Henry | | The bullied boy. |
| Howie | | One of H.G Kane's book reviewers. GK's top fan. |
| Laika | | Emma's dog. |
| Oodle McPoodle | | One of H.G Kane's book reviewers. |
