I mean in some ways you could argue the three siblings WERE the one character. Without this relationship, you wouldn't have a show.
Very good point and I agree. They all seem to balance one another out in some sort of way. If I had to choose a favorite it would be Roman because he just seems to never take anything seriously externally, but to a certain degree it is all a game to him and he hides his insecurities from others by using humor until he breaks down and no longer can do so.
The episode where he accidentally sends a dick pic to Logan was fantastic.