1 | James | Frey | An American author and businessman. Aka: Jimmy. |
| Dr. | Baker | James's physician. |
| Lilly | | One of the patients. |
| Roy | | A model patient. |
| Larry | | One of James's roommates. |
| Warren | | One of James's roommates. |
| John | Everett | One of James's roommates. |
| Ken | | The Unit Recovery Counselor. |
| Hank | | A driver. |
| David | Stevens | A dentist. |
| Leonard | | One of the patients. |
| Amy | | One of James's friends. |
| Lucinda | | One of James's friends. |
| Courtney | | One of James's friends. |
| Lincoln | | The Unit Supervisor. |
| Joanne | | The Staff psychologist. |
| Ed | | One of the patients. |
| Ted | | One of the patients. |
| Michelle | | James's friend. |
| Michelangelo | | Leonard'd adoptive father. Aka: Mikey. |
| Geena | | Michelangelo's wife. |
| Eric | | Roy's friend. |
| Julie | | One of James's friends. |
| Kirk | | One of James's friends. |
| Bob Jr. | | James's brother. |
| Anna | | One of James's friends. |
| Adrienne | | One of James's friends. |
| Eben | | One of James's friends. |
| Jody | | One of James's friends. |
| Matt | | One of James's friends, |
| Kevin | | One of James's friends. |
| Andy | | One of James's friends. |
| Laura | | The Bald Man's daughter. |
| Jennifer | | Laura's sister. |
| Terry | | Bald Man's wife. |
| Tina | | Terry's wife. |
| Ira | | One of Bald Man's neighbor. |
| Len | | One of Bald Man's neighbor. |
| Ginny | | Len's wife. |
| Matty | Jackson | Former undisputed Featherweight Champion of the World. |
| Mles | Davis | James's new roommate. |
| Bobby | | One of the patients. |
| Jack | | Roy's alter ego. |
| Keith | | Lincoln's acquaintance. |
| Daniel | | A counselor at the Family Center. |
| Freddy | | A low-level dealer. |
| Sophie | | One of the addicts in an AA group. |
| Tony | | Husband of an alcoholic. |
| Lynn | | James's mother. |
| Randall | | A lawyer. |
| Emily | | James's acquaintance. |
| Bob | Frey | James's father. |
| Michael 1 | | One of the patients. |
| Snapper | | One of Leonard's closest friends. |
| Fred | | A boy who had a broken nose. |
| Michael 2 | | A boy who was tricked in a hole. |
| David | | A boy who was placed in a coat box. |
| Clay | | One of James's friends. |
| Sean | | One of James's friends. |
| Rob | | James's acquaintance. |
| Father | David | A priest. |
| Ella | | Miles's daughter. |