Agni

"Blood runs thicker than gold."

When Agni was a kid, he had a human form, being able to transform from his human form to a draconic canine, though, that all changed when he and his sister Vulcan were taken right from under their parents noses. He and his sister went through various experiments over and over and had to fight in death matches to survive, if they wanted to live, it was either kill or be killed.