I've made Krystil's personality! She's a bit of a klutz, and oblivious to how non-royalty live. Krystil is generally very social with ponies, trying to befriend them instead of Changelings. She tries to use her authority and be regal when she has to, but ends up looking like she doesn't know what she's doing. And she really doesn't know, either.
Since she was little, Krystil was taught to be evil, but disliked it. Even small pranks she had to pull made her feel guilty. #Krystil