| Ipphy | Bailey | Jacob's co-patient at the hospital. |
| Alistair | Barnes | A boy whose father shot himself in the head. |
| Big | Bertha | The ringling. Jacob's boss. |
| Alan | Bunkel | The ringmaster. Aka: Uncle Al. |
| Grzegorz | Grabowski | Camel's friend. A circus pole. Aka: Greg. |
| Catherine | Hale | Jacob's classmate. |
| Bucky | Hayes | A boy with an unemployed father who simply wandered off. |
| Edmund | Hyde | The bank's lawyer. |
| Dinah | Jankowski | Jacob's daughter. |
| E. | Jankowski | Jacob's father. |
| Jacob | Jankowski | Narrator. |
| Joseph | Jankowski | Jacob's son. |
| Peter | Jankowski | Jacob's son. |
| Ruth | Jankowski | Jacob's daughter. |
| Simon | Jankowski | Jacob's son. |
| Diamond | Joe | The head horse honcho. Aka: Crazy Joe. |
| Buck | Jones | The circus cowboy. |
| Lovely | Lucinda | The 885-pound fat girl circus performer. Aka: The Human Ostrich. |
| Charles | M. Livingston | A world famous circus performer. |
| Willard | McGovern | Jacob's professor. |
| Joseph | McGuinty | A retired lawyer. |
| Mr. | McPherson | A man who accidentally kills Jacob's parents. |
| Reginald | Monty | A boy who tried to live by his car. |
| Charlie | O'Brien III | Jacob's new friend. A man who works on circus. |
| Frank | Otto | The world's most famous tattooed man. |
| Dr. | Rashid | Jacob's doctor. |
| August | Rosenbluth | Marlena's husband. The Equestrian director. |
| Marlena | Rosenbluth | August's wife. A circus performer. |
| Silver | Star | Marlena's favorite horse. The lead horse in the liberty act. |
| Mr. | Wilkins | The dean at Jacob's school. |
| Henry | Winchester | Jacob's schoolmate who dropped out. |
| Albert | | Marlena's friend. |
| Barbara | | A circus performer. Marlena's friend. |
| Bill | | Camel's friend. |
| Blackie | | Camel's friend. |
| Boaz | | Silver Star's predecessor. |
| Bobo | | One of the circus horses. |
| Camel | | A man who introduced Jacob to the circus. |
| Cecil | | Camel's friend. The sideshow talker. |
| Charlie | | Jacob's circus co-worker. |
| Clive | | The man who handles the cat in menagerie. |
| Dick | | The bullman at Nesci Brother's circus. |
| Doris | | Jacob's co-patient at the hospital. |
| Earl | | A man who took care of Jacob in circus. |
| Edward | | Jacob's roommate. |
| Ezra | | One of the circus workers. |
| Grady | | One of the Circus's flyers. Jacob's friend. |
| Hazel | | Jacob's companion in the hospital. |
| Isabelle | | Jacob's granddaughter. |
| Jimmy | | One of the circus boys. Jacob's co-walker. |
| Kinko | | Jacob's circus co-worker. Aka: Walter. |
| Leo | | Another circus tiger. |
| Lottie | | The aerialist. Marlena's friend. |
| Nell | | Barbara's friend. |
| Norma | | Jacob's co-patient at the hospital. |
| Otis | | Jacob's circus co-worker. |
| Pete | | Jacob's co-worker. |
| Queenie | | Kinko's dog. |
| Rex | | The circus tiger. |
| Rosemary | | Jacob's nurse. |
| Rosie | | August's new elephant. |
| Wade | | One of the circus boys. Jacob's co-walker. |
| Will | | Camel's circus co-worker. |
