Idk if she's still available, but here are some things that I would do with her: 

I would name her Arula and she would be friends with two of my characters, a demon named Scarlett and a demon named Blaise. 

I would make her an angel/demon mix 

her pronouns would be she/her and she would be asexual and biromantic 

she would love roses and LOVE the color (shade?) black, her whole room would be decorated in black and red with little accents of white 

she would have grown up in a wealthy family with a two mothers 

she would have no tolerance for people who decide not to respect her or who she is, and she would be quick to cut toxic people out of her life 

she would have this tinge of violence in her with a sickly sweetness that always feels slightly forced, but that's just because expressing her emotions isn't her strong suit

she'd be a little stuck up and egotistical without meaning to be

she would have a secret tendency to take in stray cats and shelter them, finding them good homes and families to live with (unless she got too attached... then she might keep them for herself) 

she would be very powerful, one of her powers including the ability to evaporate others into her shadow, giving herself a longer life (and the younger the victim, the longer she would herself look/stay young)