This idea does sound interesting so I'm going to offer Walter Staghart as a participant.

Using an enchanted book for them to be trapped in reminds me of a part of a game I love playing, where one of the expansions has an enchanted book of fairy tales (three pigs, little red riding hood, the boy who cried wolf, jack and the bean stock, the boy who cried wolf and a couple other fairy tales) It was designed to be used by the children of a noble, to play games, recreate the fairy tales and do other things with the characters. In the game the illusions in the enchanted book were past their 'due date' so were more unstable...the characters had more a mind of their own...but still not overly dangerous. Overall the book had all the typical children's fairy tale characters.

A twist would be to have our characters become the fairy book characters and not necessarily from the same fable.

Whichever book you decide to base it off of, I'm good with having Walter paired up with Juliana or somebody else's female character if there are extras. He's not interested in men so if there's to be any romance it'll have to be a woman. Unfortunately i don't have any female characters to offer.