Robbie is a nobleman and an 18-year-old genius boy, he was subjected to mental pressure and physical damage from his mother in the past, so he suffers from a sadistic problem psychologically, he kills his mother and is imprisoned, Until Kuro and Berlian rescue him from prison and after that Robbie joins them to destroy the nobles.
He is very interested in researching the human body and supernatural powers. he is not very interested in girls, Robbie likes Jace in the future. 