Since I made Sonata already, I wanted to do the other two. Counterpart of and colours from her siren self. I gave her a tail like everyone else does but slightly changed.
 
I wanted to give her all the things she needs to match my ponified siren headcanons, those being how they need their artefact of choice (for the dazzlings that means their gem) needing to be on them at all times or they revert back to a siren. (No one else can utilize it, only them) They cannot change their pupil shape, it will always be a diamond; and they cannot get rid of a small pair of fangs. I went for Unicorn as it’s probably the canonical choice tbh.
 
Really, I bet this is 99.9% of everyone’s first exposure to this headcanon, despite me using it for almost two years now, I just haven’t done it with any canon sirens so it’s probably not really noticed.
 
Enjoy your canon waifu, don’t expect me to do this kind of thing much.