Marie-Grace's teacher at St. Teresa's Academy.
A customer of Jean-Claude Rey's. Cécile sees him with his son when she and Marie-Grace are sneaking into each other's balls; she worries that he will spot her.
A young boy among the many orphans living at Holy Trinity. He becomes attached to Marie-Grace and enjoys playing with her.
A circus employee who works with elephants seen in The Cameo Necklace.
An abandoned baby left at the Gardners' doorstep in Marie-Grace and the Orphans. He has blue eyes and brown hair, and his skin is light enough that it is unclear if he is a child of color. Marie-Grace names him for the street he was found on, St. Philip Street.
Mr. Hearst, a manager of a local plantation, claims that Phillip is the child of a runaway slave and therefore is the legal property of the nearby plantation until he is discouraged. The Gardners care for Phillip until he can join Holy Trinity's orphanage. Cécile and Marie-Grace dress him in fancy clothes so he will be more likely to be accepted. Marie-Grace finds comfort in caring for Philip because he reminds her of her brother Daniel who died four years previously.
Philip is later sent away to an orphanage in Chicago due to the yellow fever epidemic in New Orleans.
An elderly man and butcher. He is nicknamed the Old Goat Man due to his white hair and beard and resemblance to a goat.
The eldest child of Mrs. Rumsford. Annabelle has blonde curls and a rag doll named Priscilla.
The priest at Holy Trinity. He decides whether or not an abandoned child is allowed to enter the orphanage.
A dog trainer who works in the circus.
The captain of The Liberty during Marie-Grace's trip in The Hidden Gold.
A seamstress seen in The Haunted Opera making costumes for the chorus members of Foxcroft's London Opera Company.
A classmate of Marie-Grace Gardner at St. Teresa's Academy and one of Lavinia Halsworth's friends.
A pilot aboard The Liberty and a friend of Thaddeus Gardner.
The mother of Susannah Stewart. She is mentioned in Marie-Grace and the Orphans as contracting yellow fever.
A young girl visiting Dr. Gardner's office in Marie-Grace and the Orphans. Mrs. Stewart faints when Dr. Gardner is removing a splinter in her foot, so Dr. Gardner asks Marie-Grace to distract Susannah. Marie-Grace uses her skills from her voice lessons to sing a song with her.
Octavia Tay's husband and Cécile's uncle. Henry was likely from Philladephia as Octavia's in-laws still live there. He died in an accident at the shipyard in Philadelphia mid-year 1852.
A member of Foxcroft's London Opera Company.
A free woman of color who owns a candy shop. She is renowned for her pralines, and Cécile and Grand-Père like to stop by the shop for them and other sweets. She greets Simon Rey and Cécile upon their arrival and has her hair up in a colorful scarf. She playfully teases Simon that he might get Cécile some bonbons and points them out, then properly greets the white Americans who arrive and insult her, Simon, and Cécile in calling them slaves, her breath catching from the insult. She gives Simon his wrapped package quickly before he and Cécile leave.