Set the Scene
Hans Westergaard is the 13th prince of the Southern Isles, a small island kingdom near Arendelle. Growing up with 12 older brothers and his parents, the tyrannical king and absent queen, his childhood was exceptionally lonely and harsh. In a family that values power above all, Hans was, by default, a pariah. He was never destined to rule, and spent all his childhood proving his very existence. His unlucky 13th rank already put him at a disadvantage, and he did anything -- absolutely anything, nothing off limits -- he could to please the people who were supposed to love him but never would. Instead of turning against his family, he internalized these ideas about power and that it should be pursued at all costs. When he heard about the tragedy that befell Arendelle's king and queen, he saw an opportunity to seize the power he dreamed of, and finally have a chance to escape the endless abuse at his family's hands. Over the next 3 years, he kept his father's favor to be a representative of the Southern Isles at the coronation of Arendelle's new queen -- which would take place once she came of age -- committing crimes of varying severity on the king's behalf. The experience, even more pointedly than his entire life's suffering, hardened him into the criminal he would become.