Elliot is the step brother of Gilbert Nightray and Vincent Nightray. Elliot is the only remaining son of the Nightray couples and is the heir to the Nightray family.
Elliot is hotheaded, outspoken and always forces his opinions on everybody else. Ada, however, thinks he is a nice and dependable person deep down. He first meets Oz in the Latowidge library where they get into a fight over a character in the novel series "Holy Knight" (Elliot spoils the ending for Oz's favorite character, Edgar). He hated the Vessalius family. He also doesn't like Ada calling his name and despises how the Vessalius seem to get away with anything just because they were heroes 100 years ago. He seems to be greatly annoyed by Gilbert, but in reality cares about him.
In recent chapters, however, Elliot's hatred towards Oz has dissipated, and the two of them have become good friends.