| | | | 2038 |
| | Jacinda | Greenwood | A forest guide in Greenwood Arboreal Cathedral. Protagonist. |
| | Knut | | The most senior forest guide. Jake's closest friend. |
| | John | Muir | An advocate of U.S. conservation. |
| | Torey | | A young guide. |
| | Davidoff | | A Russian special forces operative. Jake's boss. |
| | Corbyn | Gallant | The celebrity pilgrim. Jake's client. |
| | Meena | Bhattacharya | A first chair violist. Jake's mother. |
| | Liam | Greenwood | Jake's father. Willow's son. |
| | Dr. | Biswas | A leading expert on bodhi tree. |
| | | | General Sherman - The world's biggest tree. |
| | Harris | Greenwood | The owner of Greenwood Island. |
| | Willow | Greenwood | Harris's daughter. Jake's grandmother. |
| | R.J | Holt | The founder of Holtcorp. |
| | John | Rockefeller | The Greenwood Island's former owner. |
| | | | 2008 |
| | Alvarez | | Liam's helper. |
| | Temple | Van Horne | Liam's great-aunt. |
| | George | Nakashima | A master woodworker. |
| | Tanya | Petrov | An oil oligarch's wife. |
| | | | 1974 |
| | Sage | | Willow's ex-lover. |
| | Everett | Greenwood | Willow's uncle. Harris's brother. Aka: Saul Bowater. |
| | Liam | Feeney | Harris's translator. |
| | | | 1934 |
| | Harvey Bennett | Lomax | Mr. Holt's driver. |
| | Euphemia | Baxter | One of Mr. Holt's employees. |
| | Lavern | Lomax | Harvey's wife. |
| | Harvey | Lomax Jr. | Harvey and Lavern's son. |
| | Hattie | Lomax | Harvey and Lavern's daughter. |
| | Howard | Blank | A war veteran. Everett's companion. |
| | Pee-wee | Morton | Everett's acquaintance. |
| | Mort | Baumgartner | One of Harris's colleagues. |
| | H.R | Macmillan | A timber syndicate leader. |
| | Terrance | Milner | Harris's long-time clerk. |
| | Fiona | Craig | Harris and Everett's guardian. |
| | Sinclair | Monahan | The buggy driver. Everett's boss. |
| | Mrs. | Papadopoulos | Pod's babysitter. |
| | Art | McSorley | A railroad detective. |
| | Pod | | The baby that Everett finds. |
| | | | 1908 |
| | James | Craig | Fiona's husband. A physician. |
| | Parson | Brennan | Mrs. Craig's companion. |
| | Taisto | Maki | The town's famous woodcutter. |
| | Ms. | Miller | Harris and Everett's teacher. |
| | Doc | Kane | Mrs. Craig's doctor. |
| | Sam | Sharpe | A Lt. Colonel. Harris's boss. |
| | Gilles | Thibault | The headmaster of the deaf and blind academy in Montreal. |
| | | | 1934 |
| | Gertie | | Temple's cook. |
| | Jurgen | Kohler | Temple's husband. |
| | Bennett | | The prime minister. |
| | Cook | | The ship captain. |
| | | | 1974 |
| | Frederick | Weyerhaeuser | The deceased lumber king. |
| | | | 2008 |
| | Orin | | Liam Greenwood's friend. |
