What my history in my character application says:
Katsa lost her parents to the resistance at the age of 15. She was taken into the care of the government and given the shot that was said to test for and possible cure cancer. It turned out that it was actually testing for people with the genesis gene and it turned out that Katsa had that gene. She gained a few very interesting abilities. Katsa was sent to a government run orphanage where she stayed for two years until she was 17 years of age. There she trained and studied to become the perfect agent, always thinking if crushing the resistance that killed her parents. At first they tried to brake her, make her obedient, saying that she needed to learn manners and so on but they soon gave up. It was becoming obvious that she would not brake, let alone bend. She started as a solo agent but was recently partnered with another agent named Darius.
((i will elaborate when i have more time... and when i actually feel like typing more. this is just a quick overview of her history))