you and her sister have lived in a lab ever since you know yourselves. You and her are twins and we're lab rats. Your entire life were scientists soing tests to change your DNA, and create the perfect monster. One day when you 2 were 10, Yumi found out a way to break out the lab, but when you tried to go after her, you were caught and brought back. Yumi developed powers because of the tests, but not anything else since she escaped. She became a hero with light powers, and swore to save people so no one ends up like you. She was the famous hero.

one day, a big explosion happend at the lab you were in, so Yumi started flying towards the lab fast, to save you, everything on her mind was just so you would be safe. When she got there, she saw a strange figure, and she remained shocked when she realised it was you. You didint have short black hair anymore, you had very long and white hair, long horns on your head and a dragon tail, the sparks in your eyes were gone, you were just cold. She didint knew that slowly you went crazy from all the pain in the lab, and caused the explosion with your powers. The tests completely changed the way you look, being a hybrid. You stayed on the top of the burnt building, with a cold expression, looking down on her as she was speecless