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.
- He is widely believed to be the most likely culprit for the car crash at the end of Book 2 (though this isn't definite). Reasons include; the crash happened shortly after the main character's courtroom victory, the fact that Tyler was the one whose car was hit when Tyler's friendship with Sebastian was at least partly the reason why Sebastian turned against Dorian and the fact that he is probably the only character who could afford to trash a car and dispose of it (as well as have the resources to cover his tracks) all to get revenge. In The Junior, Chapter 11, it is revealed that Nathan, instead of Dorian, was the one who crashed his car into Tyler's.
- Subsequently, Sebastian revealed that Dorian is an Alpha Theta Mu alumnus.