- 1 Nathaniel
- 2 Captain Newman
- 3 Annie O'Callghan
- 4 Jamie O'Connor
- 5 Mr. Parkington
- 6 Alice Pitt
- 7 Mrs. Pitt
- 8 Arthur Porterfield
- 9 Eloise Raven
- 10 Horace Raven
- 11 Roger
- 12 Annabeth Ross
- 13 Ruby
- 14 Mr. Ryland
- 15 Mrs. Ryland
- 16 Charles Stallsworth
- 17 Emily Stallsworth
- 18 Henry and Ian Stallsworth
- 19 Miss Stevens
- 20 Hildy Stewart
- 21 Tissie
- 22 Trapper Jim
- 23 Mrs. Van Sicklen
- 24 Clarisse Van Sicklen
- 25 Bertie Vanderhoff
- 26 Robert and Mrs. Vanderhoff
- 27 Mrs. VanVorst
- 28 Fitzwilliam Wharton
- 29 Harrison Wharton III
- 30 Helen Whitney
- 31 Mr. Winthrop
- 32 References
Jessie's infant son. He is the reason that Jessie quits working for Grandmary because Jessie needs to stay home and watch him; when Jessie comes back, she brings Nathaniel with her. In Samantha's Surprise, Samantha has written and illustrated a picture book for him.
The captain of the R.M.S. Queen Caroline. He's acquainted with Archibald Beemis.
An Irish girl on the S.S. Londonia. Her family arrived in America two years ago in 1904, but as her father could not find work (since people will not hire Irish) they are returning to Ireland. Samantha describes her as thin and kind. and takes a picture of her and gives her her address to write her.
A teenage boy who's acquainted with Nellie O'Malley. In The Stolen Sapphire he entrusts Nellie with a packet of money and tells her to mail it in Queenstown, Ireland, so his cousin Rory can be sent over to America.
Samantha's father and the husband of Lydia Parkington. He died with his wife in a boating accident at Piney Point, leaving Samantha an orphan when she was five. Very little is revealed about him through the course of the series.
In Samantha Saves the Wedding, she ruins Cornelia's veil by chopping it up to play "bride".
In the movie, a character similar to Alice is cast but is called "Agatha." She destroys Cornelia's veil by accidentally catching it to a heating curling iron over open flame and setting it afire.
The mother of Cornelia, Alice, Agnes, and Agatha Pitt. In The Curse of Ravenscourt, Cornelia goes to visit her in Connecticut. She has a piercing voice. She is married to Horace Pitt, going by the name Mrs. Horace Pitt.
Horace Raven's daughter. She only appears in The Curse of Ravenscourt. Eloise mentions that she went to Miss Penwald's Academy, the same school as Cornelia.
The owner of Ravenscourt, a hotel in New York City. He only appears in The Curse of Ravenscourt.
The footman at Lockston Castle.
A young woman the protagonist and Samantha meet in The Lilac Tunnel: My Journey with Samantha. She's on her final month of training with Dr. Barnett, later hoping to begin her own practice. She assists Dr. Barnett by adjusting the lamp during the protagonist's examination.
Mrs. Ryland is Eddie Ryland's mother. She has a rasping voice. She initially hired Nellie O'Malley as a worker, but sent her back because she wasn't healthy. When Nellie's family is hired by Mrs. Van Sicklen, she thinks that it's a disgrace for the family to live there and questions Samantha spending time with the girls.
Charles's late wife. She is mentioned as having passed away six months prior to the events of Clue in the Castle Tower. Her portrait can be seen on the book's cover.
Henry and Ian Stallsworth
Charles and Emily's twin nephews. They are only seen in Clue in the Castle Tower.
Samantha's teacher at Miss Crampton's Academy for Girls. She wears gold rimmed spectacles that, to Samantha, seem to see everything.
In the movie, she tries to disqualify Samantha after the speech contest for having changed her speech from her original submission.
A maid hired by Cornelia Edwards to accompany Samantha and Nellie from New York City to Piney Point in The Cry of the Loon.
A girl in Samantha and Nellie's school in New York City. She went on a hot air balloon ride for her eighth birthday. She wants to marry a duke like Consuelo Vanderbilt when she is older and live in a castle. She is clearly from a well to do family.
Mrs. Van Sicklen
The woman who hires the O'Malleys as a family. She hires the whole family to work for her. She is a larger character in Samantha and the Missing Pearls. When Mr. and Mrs. O'Malley die, she sends Nellie and her sisters away.
Clarisse Van Sicklen
A student in Samantha's class. She is likely a relative or the daughter of Mr. and Ms. Van Sicklen and is friends with Edith Eddleton.
The young son of Robert and Mrs. Vanderhoff.
Robert and Mrs. Vanderhoff
A wealthy couple from Buffalo, New York seen touring Paris in Danger in Paris.
Mr. Vanderhoff is the owner of Vanderhoff's Mills, which he boasts sells the finest wheat flour in New York.
The teacher of the kindergarten classes at the settlement house; described as stout and kindly.
A renowned archaeologist seen transporting the Blue Star sapphire to London in The Stolen Sapphire.
Harrison Wharton III
The nephew of Fitzwilliam Wharton. He accompanies his uncle to London and brings along his pet monkey, Plato.
One of Samantha's classmates. In Samantha Learns a Lesson, she passes a note to Samantha asking, "What the dickens does la gorge mean?" Samantha tries to tell her the throat through hints, but she mistakenly says "neck." She is the first to give her speech on progress in the school competition.
She and her sister perform in the talent show together as singers in Samantha's Special Talent.
The manager at Ravenscourt. In The Curse of Ravenscourt, he was paid by Mr. Enderby to cause various accidents to scare residents away from Ravenscourt.
- The picture is actually from the S.S. Pennland of the Red Star Line in 1893.
- The Lilac Tunnel, pg. 14: Realization dawns on Elsa's pinched faced. "Ah," she says. "You must be Ruby - the laundry girl we sent for from the city. But Mrs. Edwards wasn't expecting you till summer's end! I've got enough work this week preparing for our trip to Piney Point. The last thing I need is to be looking after a new girl."
- The Lilac Tunnel, pg. 15: To tell Elsa that I'm Ruby, the laundry girl, turn to page 26.