Dorian has blond hair, brown eyes, and fair skin. He wears a blue suit over a white dress shirt and a blue necktie with white dots.
Dorian is a ruthless businessman who doesn't hesitate trying to have Enrique Vasquez's old house condemned in order to make way for a mall he plans to build in the location. He also treats other people with contempt, such as remarking that Zack has a rather "histrionic proclivity" after the latter's complaints about Sebastian sabotaging the house boiler. He is also shown to use illegal means, such as bribing city officials, to get his way.
Sebastian is Dorian's son, whom he looks down on for his failure to do what he's told to do.
- He has a slight resemblance to the 45th U.S. president Donald Trump.
- His crimes include bribery, not properly supplying his employees with safety equipment, and having an unlicensed construction site.
- In The Junior Book 1, Chapter 11, Sebastian reveals to the gang that Dorian is an Alpha Theta Mu alumnus.