I chose this one for Calla just because she does tend to be all bright and cheerful - to the point where you can get sick of her if you've had too much - just like candy.

I chose this one for Mander for likely very easy to understand reasons - he'd spend all his time with books rather than people if he had the choice.

I chose this for Jules for a bit of a less intuitive reason, but it made me think of layers with all the balconies and sort of the faces expected of him by different parties/people. The second reason because of the concept of time ticking down and looking back with regrets and what ifs?

I really couldn't find one I felt fit Cora or else I'd've done her as well!