Bellatrix is a bounty hunter who is paid to go after dangerous criminals and space creatures.
She isn't very fond of her job at times, as it's not a rather glamourous job, but it pays for her spaceship expenses. So she grits her teeth and bears with it. She’s cocky, but rightfully so, as she has a good aim with her raygun.
She grew up in a distant colony and moved out onto her own spaceship to explore the galaxy.