Hela was once human until her Second cousin turned her into what you see above (a dragon-like beast made up of robotic parts with living skin half way on it). Her original name was Helena and she and her twin brother got stuck living with her Second cousin because they seem like the right candidates that show the right qualities to learn from thier second cousin to take care of the tech that belongs in their family. Once Helena started to get some physic abilities, her Second cousin decided to turn her into this beast to stop that power and to show the world the evil she is. Her brother and her eventually decide to kill their Second cousin buy asking Young Sety for his help. Together they steal souls to create robots and monsters and she was always enjoys helping her brother get the souls he needed for his projects. And eventually started working for Mrs. Vondra Rusalka. But if Hela ever dies her soul will be forever traped in her Second cousin's database with all the other souls her Second cousin has turn into robots, waiting for her Second cousin to reboot and use them again.
More will be told when I post her brother and her Second cousin.
This I drew Hela and colored her in Photoshop. The background is a photo I took and then manipulate in Photoshop to match Hela.