Professor Calliere: Calliere is Iolanthe’s husband and plays a bigger part in books 1 and 3, but he does play his part here as well.
Lon Fonstan: Lon is one of those guys who appears on maybe a page in each of the books, but he’s there and he has some fun interactions with others, especially Senta. He really shines in book 3.
Mr. Brockton: Brockton is a wizard who appears in books 2 and 4. He works in the War Ministry with Wizard Bassington, but isn’t nearly as powerful.
Miss Gertz: Miss Gertz is the mayor’s secretary.
Mrs. Godwin: An old household servant of the Dechantagnes, Mrs. Godwin lives in the family house.
Paxton Brown: Brown makes his appearance in The Dark and Forbidding Land, but doesn’t really become an important character until book 5.