| 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. |
