While Diggie is mostly embarrassed of his younger brother, due to his overbearing, egotistical, and geeky personality, and because of his weird hobbies. She thinks Artie is acting up because his role model Diggie is moving to other places like, Tundrabania and Australia. They used to appear to get along great and are very similar to one another.
Later in it is revealed in End-A-Rooney, Diggie goes with Maddie so she can build tiny houses for the homeless and they can be together.
He’s loyal and a great friend, not only to Maddie but to her brother Joey, and to all of Maddie’s friends as well as Liv.
Diggie is shown to be also quite obsessive with certain things, such as Maddie since he got jealous of her with Josh and didn't like her being with him.
Diggie usually wears casual clothes throughout the series. He is often seen wearing the purple and white Ridgewood High letterman jacket.
Diggie was 6 feet tall in season 1, however he has burst forth and grown to tower over all cast members at his colossal size of 6 feet 6 inches and is still getting bigger and his body is still enlarging. At school Diggie struggles to not be seen as he is too much of a skyscraper and soars above the lockers.