| 1 | Mary Katherine | Blackwood | Protagonist and Narrator. aka: Merricat. |
| | Constance | Blackwood | Mary Katherine's Sister. |
| | Amanita | Phalloides | The Death-Cup Mushroom. |
| | Julian | Blackwood | Mary Katherine's Uncle. |
| | Stella | | Owner of a Shop. |
| | Helen | Clarke | Family Friend of Mary Katherine. |
| | Mr. | Elbert | Owner of a Grocery Store. |
| | Mrs. | Elbert | Mr. Elbert's Greedy Wife. |
| | Mrs. | Donell | Mary Katherine's Neighbor. |
| | Jim | Donell | Mrs. Donell's Husband / A gossiping neighbor. |
| | Joe | Dunham | The carpenter. |
| 2 | Jonas | | Mary Katherine's cat. |
| | Mrs. | Shepherd | A Church regular. |
| | Mrs. | Rice | A Church regular. |
| | Mrs. | Crowley | A Church regular. |
| | Mr. | Carrington | Friend of Mary Katherine's father. |
| | Lucille | Wright | Helen's friend. |
| | John | Blackwood | Mary Katherine's father. |
| | Dorothy | Blackwood | Julian's wife. |
| 3 | Dr. Jack | Mason | Doctor of the Blackwood family. |
| | Dr. | Levy | Jack Mason's colleague. |
| 4 | Charles | Blackwood | Mary Katherine's cousin. |
| 5 | Arthur | Blackwood | Charles's father. |
| | Thomas | Blackwood | Constance and Mary Katherine's brother. |
| 8 | Jim | Clarke | Helen's husband. |
| 9 | Kim | Clarke | Jim's brother. |
