From the FA page: "Probably not a huge surprise that I was into MLP for a time. And also that I was doing MLP roleplaying back when I actually touched a "chan" or two. Thanks to Ramudey for doing these more up to date anthro designs for them.

They're siblings, and both supernatural martial artists, though Crystal is dedicated to it, and it's even her special talent — her cutie mark is basically a Hadouken. Quartz' special talent is lie detection — he can passively determine the absolute truth of a response to a question, provided it can be answered in a simple yes or no manner. He is also hermaphrodite, and genderfluid, but generally identifies as male — when female, she's often got a more feminine hairstyle and huge tits like her sister. Magic is fun like that.

(Yes, you may have seen a pic of them with Quartz having the same last name as his sister, honestly it's because I forgot what his real last name was for ages. I decided to settle on 'Axiom' to better fit his talent.)"