| | | | The Offspring |
| | Marilyn | Sorenson | David Sorenson's wife. Aka: Marilyn Margaret Frances Connoly. |
| | Wendy | Evelyn | Marilyn's eldest daughter. |
| | Violet Rose | Lowell | One of Marilyn's daughters. Aka: Viol. |
| | Grace | | Marilyn's youngest daughter. Aka: Gracie |
| | Liza Ann | | One of Marilyn's daughters. Aka: Lize. |
| | Goethe | | A dog. |
| | Miles | Eisenberg | Wendy's husband. |
| | David | Sorenson | A doctor. |
| | | | Part I - Spring |
| 1 | Wyatt | | One of Violet's sons. Aka: Wy. |
| | Eli | | One of Violet's sons. |
| | Carson | | One of Wendy's acquaintances. |
| | Carlton | | One of Wendy's acquaintances. |
| | Loomis | | A dog. |
| 2 | Ryan | Marks | Liza's live-in-partner. |
| | Matt | | Violet's husband. |
| | Hanna | | Jonah's foster mother. |
| | Jonah | Bendt | Violet's teenage son. |
| 3 | Mrs. | DelBanco | A Math teacher. |
| | Terrence | | Hanna's husband. |
| | | | Part II - Summer |
| 5 | Carol | | Matt's receptionist. |
| | | | 1977-1978 |
| | Professor | Grady | Marilyn's teacher. |
| | Janet | | A waitress. |
| 7 | Marcus | Spear | A professor. |
| | Sally | | One of Marcus's cats. |
| | Walter | | One of Marcus's cats. |
| | | | 1978-1979 |
| | Richard | | David's father. Aka: Rich. |
| | Dr. | Fletcher | A neurologist. |
| 9 | Steve | | Wendy's acquaintance. |
| 10 | Gillian | Levin | An obstetrician. |
| 11 | Ben | Barnes | A barista. |
| | Drew | | An employee. |
| 12 | Aaron | Bhargava | Wendy's on-and-off boyfriend. |
| | | | Part III - Fall |
| | | | 1992-1993 |
| | Kathleen | | One of the nurses. |
| 14 | Jennifer | Goldstein | Violet's friend. |
| 15 | Genevieve | Wilmot | Violet's acquaintance. |
| | Gretchen | Morley | The Vice President of the Parents' Association. |
| | Ashton | Treslo | Violet's acquaintance. |
| | Harry | | Wyatt's friend. |
| | | | 1994-1995 |
| | Spencer | Stalling | Wendy's friend. |
| | | | 1995 |
| | Dr. | Carlson | Wendy's doctor. |
| 17 | Yesinia | | A housemaid. |
| | Autumn | | Spencer Stalling's acquaintance. |
| | Ivy Marilyn | Eisenberg | Wendy's stillbirth child. |
| 18 | Caitlyn | | One of Grace's friends. |
| | Emily | | One of Grace's friends. |
| | Sharon | | One of Grace's friends. |
| | | | 1996 |
| | Adrian | | David's friend. |
| | | | Part IV - Winter |
| 21 | Jax | | Wyatt's classmate. |
| 22 | Candace | | Grace's acquaintance. |
| 23 | Ruth | | Secretary of the Parents' Association. |
| | | | 2000-2001 |
| | Rob | | Violet's ex-boyfriend. |
| 25 | Jen | | Aaron's wife. |
| | Evie | | Aaron's baby. |
| 26 | Luke | | A bartender. |
| 27 | Dan | | David's acquaintance. |
| 29 | Kathryn E. | Sorenson | Liza's daughter. Aka: Kit. |
| | | | 2014 |
| | Alan | | A driver. |
| | Todd | | A financial analyst. |
