* Dianna is a character from the prequel novel "A Court of Silver Flames" in the same world. While she isn't a major character, she plays a significant role in the story.
* Cole is a character in the series' main novels, "A Court of Thorns and Roses," "A Court of Mist and Fury," and "A Court of Wings and Ruin." He's a significant character in the first two books, though his role diminishes in the third.
Let me know if you're looking for another book with these characters!