| | | | Part 1 |
| | Rosa | | One of the Artificial Friends. Klara's companion. |
| | Beggar | Man | The beggar at the RPO building. |
| | AF | Rex | One of the Artificial Friends. |
| | Klara | | Protagonist. |
| | | | AF - Artificial Friend. |
| | Manager | | The Artificial Friend seller. |
| | Caroline | | The daughter of the Artificial Friend customer. |
| | Coffee Cup | Lady | One of the customers at the RPO building. |
| | Cooting | Machine | The machine that blocks the sun. |
| | Josie | | The 14-year old girl who chooses Klara. |
| | Sung | Yi | A B3-Type of Artificial Friend. |
| | Rain Coat | Man | Coffee Cup Lady's lover. |
| | | | Part 2 |
| | Melania | | Josie's housekeeper. |
| | Mr. | McBain | Josie's neighbor. |
| | Rick | | Josie's best friend. |
| | Professor | Helm | Josie's professor. |
| | Peter | | One of Chrissie's friends. |
| | Chrissie | Arthur | Josie's mother. |
| | Missy | | One of Rick's neighbors. |
| | Danny | | The boy who was detained by the police. |
| | Phil | | Danny's friend. |
| | Sara | | One of Chrissie's friends. |
| | Dr. | Ryan | Josie's doctor. |
| | Sal | | Josie's dead sister. |
| | | | Part 3 |
| | Mrs. | Rivers | Chrissie's friend. |
| | Miss | Helen | Rick's mother. |
| | Henry | Capaldi | The portrait guy. |
| | | | Part 4 |
| | Cindy | | The waitress. |
| | Benjamin | | Paul's friend. |
| | Paul | | Josie's father |
| | Vance | | Helen's ex-lover. |
