Pain. The only thing she's known for the past hundred years. Wait, that's a lie. There's also hatred, and disgust for the men that continue to torture her. And worry, oh so much worry for her sister. She'd lost Finch hundreds of years ago trying to flee their enemy and escape to the next galaxy filled with life.
Earth of course was what Raven found, she watched from afar while the Earth went through its phases. From dinosaurs to birth and expansion of human beings. Taking the form of one of these humans, she looked to be a supermodel with her pitch black hair, jade green eyes, and perfect complexion. Her powers could make and destroy galaxies, but she chose to hunt down threats to humanity, killing them and disappearing without a trace.
She of course had to hide her true form and her golden dragonfly wings. In her true form she had golden scales and golden hair. But being able to change her appearance and colors at will, she often went with whatever she wanted.
She'd never known how she had been captured by the organization that called themselves sector 7, but despite what they had said around her she knew she would never do what they wanted her to. Anytime they tried to cut her open she'd turn her skin diamond hard. Electrocute her? She'd only absorb it and spit it back out at them. She'd read their minds, she knew what was in here. A giant metal alien along with a life giving cube, she'd often snuck out while invisible as she searched for a way out. She new exactly when she would have her chance to escape. And it started when they carted in another mechanical alien to the torture room where she lived her life.