I've got a concept but it's still pretty nebulous.
She's mostly going to be focused on stealth/speed/scouting stuff, with socials secondary. Probably not much help in a fight, she'd most likely run off to find help instead. Night/stars/shadows motifs, possibly thinks she's Nyx's daughter or something to that effect.
Her backstory is still up in the air, but right at this moment I'm leaning towards her having been a farmer's daughter/shepherdess, erupting in the dead of night when something (possibly a not so nice Nova) basically shows up out of nowhere and starts ripping sheep to bits. I haven't settled on specific powers yet since I don't know how many points Kol's going to give us but I'm pretty sure she's getting the Shroud ability, specifically manifesting as if a moonless midnight sky dropped down and covered whatever she's shrouding, which she uses to protect her flock and get them (and herself~) fuck out of there before they gets eaten.
She's cute and a bit shy (probably why a good chunk of her nova stuff revolves around being quiet and unseen) but the shepherdess mentality has sort of expanded to encompass all of Thera, so she sees it as her duty to watch for "wolves" and protect people as best she can. Probably also giving her mega-charisma and/or appearance but that's all still very new to her and she's not quite used to being preternaturally charming yet. Young, probably 16-18, miiiight have a little crush on the Lioness.
That's all subject to change though, I've waffled about a million times already.