Julian Blackthorn is a Shadowhunter of the Los Angeles Institute. For years, Julian lived in the Institute with Emma Carstairs, his girlfriend and former parabatai, and his siblings. He acted as the father figure of the children and secretly as the head of the Institute, hiding the illness of his uncle and bearing all of its burden alone to keep his family together. Julian was the first child born to Andrew and Eleanor Blackthorn. Some time after he was born, Andrew's children with the…