| Rolf | Benz | Founder of a German furniture company |
| Bunte | | German magazine conducting the interview |
| Michael | Burg | Ferryman |
| Mr. | Freymann | Renowned defense lawyer |
| Anna | Glass | Novelist and Viktor's patient |
| Dr. | Grohlke | Allergy specialist and Viktor's family friend |
| Patrick | Halberstaedt | Mayor of the island |
| Mr. | Lahnen | Renowned defense lawyer |
| Gustav | Larenz | Viktor's father who died of lymphoma |
| Isabell | Larenz | Viktor's former wife |
| Josephine | Larenz | Viktor's missing daughter. Aka: Josy |
| Viktor | Larenz | Protagonist; a psychiatrist dealing with trauma. Aka: Diddy |
| Professor | Malzius | Hospital director |
| Baron | Munchausen | Fictional nobleman known for exaggerated stories |
| Martin | Roth | Viktor's psychologist |
| Mr. | Shivers | Viktor's imaginary friend |
| Philippe | Starck | French industrial designer known for modern designs |
| Kai | Strathmann | Private investigator hired by Viktor |
| Professor | van Druisen | Viktor's former colleague |
| Karin | Vogt | Receptionist at Dahlem Park Clinic |
| Ida | von Strachwitz | Journalist from Bunte; Viktor's imagined listener |
| Albert | | Lonely old man |
| Charlotte | | Heroine in Anna's book |
| Eminem | | American rapper and music artist |
| Julia | | Character in Anna's story |
| Laura | | Anna's biological mother |
| Maria | | Psychiatrist involved in Viktor's case |
| Nepomuk | | Josy's favorite blue stuffed cat |
| Sindbad | | Isabell's dog |
| Terry | | Anna's former dog |
| Trudi | | Proprietor of the Anchor establishment |
