Composite Character: Sophia Bellamy has characteristics of both Percy Blakeney and Marguerite St. Just (as does René Hasard).
Like Percy, Sophia is English and she has a secret identity. Like Marguerite, she's female and her brother is captured and used as bait to lure the Red Rook.
Dating Catwoman: Sophia is forced into an engagement with René Hasard, a Frenchman who is a cousin of Albert LeBlanc and may be working for him.
Hidden Depths: Sophia seems like the unimportant daughter of a noble family fallen on hard times, but she's secretly the Red Rook.
Missing Mom: Sophia and Tom's mother died many years ago
Agent Peacock: Sophia notes that even covered in dirt and grime, he still looks like a Parisian fashion plate.
Composite Character: René Hasard has characteristics of both Percy Blakeney and Marguerite St. Just (as does Sophia Bellamy).
Like Percy, René is tall, thin, blue-eyed, fashionable, foppish, seemingly air-headed and male. Like Marguerite, he's French, red headed, he doesn't know the woman he's engaged to is the Red Rook, he was forced by LeBlanc to help identify and capture the Red Rook, and he apparently denounced the Bonnards.