This artist/musician duo is one of 7 heroes chosen to end Zero's reign of terror! (Bio WIP)

She has 2 main components making up her being

-Adrian, the body:

-A young, aspiring artist longing to finally leave her home so she can pursue her dreams. Her parents however wanted her to pursue music instead. She stormed out one night in frustration, only for something for fall from the sky right nearby... And then came a second entity some time after, much more dangerous than the last. And in a feral chase this being ended up bringing an end to poor Adrian's life... But she would come back, thought not quite the same to how she was before. Despite the confusion and lack of memory she would continue running from home after, eventually stumbling across a band of thieves who would take her in.

-Elline, the soul:

-A runaway paint fairy who found Adrian one night. Adrian took her in for shelter and in return Elline went to show her the true power of what art can do. The 2 would quickly become the best of friends! However, Elline had fled her old home for reasons more unnerving. One of her other paintress friends was out killing the rest of her group, and fled for her life the moment she found out. But when Adrian was murdered by that same witch Elline had come to the rescue for her new friend. She had even given up her own soul and became a part of Adrian, 2 in to 1. Though her body would stick around, as a magical paintbrush for Ade to use.

As for the hand odd hand, here is a reference sheet for that:

The story here is that during the events of Zeros reign, she loses her hand during a confrontation with one of Zeros sons, Iraklis. Elline's power may have reawakened to seal up the wound, but even that cant regenerate lost limb endings. Not to worry though, where magic fails science can still succeed! With G's help, Ade was able to get a proper hand replacement faster than she could say "Thanks for lending a hand, doc."