Kokoro Stewart

Kokoro Kaze Stewart 

Caden's half-sister (she was adopted), her biological parents are rulers of a kingdom far away from where she grew up with Caden. she is the rightful princess to them. she has been assigned a bodyguard/knight since she was born and set off to grow up in more "commoners" grounds. (that's Rose) she ends up falling for said knight and they have been a thing since.