| Dola |
Adebayo | One of Maria's colleagues in STM project. |
| Anna |
Botha | One of Maria's colleagues in STM project. |
| Mel |
Conklin | Philosopher Maria always quotes. |
| Leonardo |
DiCaprio | Michael's favorite actor. |
| Billy |
Gibson | Super Saver employee. Aka: Beejee. |
| Elizabeth |
Gibson | Beejee's sister; babysitter. Aka: Gibby. |
| Leonard |
Gibson | Beejee and Gibby's father; Ms. Rosario's boss. |
| Eliot |
Jameson | Physicist; Maria's colleague. |
| Teresa |
Kaminski | Gibby's friend. |
| Paige |
Kaminski | Teresa's sister. |
| Ricki |
Lake | American TV host. |
| Lois |
Lowry | Novelist. |
| Mr. |
Mosley | Maintenance man. |
| Christopher |
Pike | Novelist. |
| Jamar |
Prince | Super Saver customer. |
| Darius |
Prince | Jamar's youngest brother. |
| Elijah |
Prince | Jamar's brother. |
| Case |
Robinson | One of Maria's colleagues in STM project. |
| Michael |
Rosario | Protagonist. Aka: Mikey-Mike. |
| Ms. |
Rosario | Michael's mother. |
| Ridge |
Sabio | New kid in Michael's place; time traveller. |
| Maria |
Sabio | Chief STS at University of Delaware; Ridge's mother. |
| Shale |
Sabio | Ridge's brother. |
| Bex |
Sabio | Maria's son. |
| Ian |
Sabio | Maria's son. |
| Mr. |
Shipman | Apartment manager. Aka: Ship. |
| Aderlaine |
| Girl Ridge likes. |
| Clipper |
| The stray cat. |
| Eloise |
| Gibby's car. |
| Saeed |
| Physicist. |
| VED |
| A.I. that Maria created. |
