Double amputee? That's rare.
i really like that element of her design.

She emerged in a role-playing game with a friend.
She was in a biker gang.
In a duel with a rival gang, she was seriously injured, resulting in the amputation of both her legs and her left arm.
After nearly dying, she was expelled from the gang for being considered weak.
This led her to seek revenge on both gangs.
She wandered aimlessly for a long time until she arrived in a city where she worked as a bounty hunter.
Now she is the greatest bounty hunter ever heard of.