Oblivious to Love: Neither Bella nor Mortimer realize that they're developing feelings for each other, even though it's obvious to both the reader and the adult characters in the story.
Poster-Gallery Bedroom: Bella's room is red and filled with magic clutter and stars, both pointing towards her future.
Mysterious Past: This trope has been used multiple times by the author. Jocasta, Bella's mother's past was hinted for awhile before revealed. Other characters are also revealed to having mysterious pasts.