Thaddeus T. Third V is the richest man in the Recess City's home city. His grandfather, Thaddeus T. Third III, is the namesake for Third Street and Third Street School. He bears a strong resemblance to American financier and businessman, J.P. Morgan. He is often smartly dressed: sporting a brown three-piece suit with a bowler hat with a grey rim. He wears glasses, a bow-tie and has a mustache. He bears a resemblance to his grandfather, Thaddeus T. Third III. In both of the episodes "The Biggest Trouble Ever" and "The C Note," it is implied that he is a kind and good-hearted elderly man, who happens to be short at times. He is referred to in several episodes of the series; however, he makes prominent appearances in the episodes "The Biggest Trouble Ever" and "The C Note." In the former episode, he appeared in the court at the end of episode to give the gang a character reference saying they were just kids, they didn't mean to destroy the statue and that many others - some amongst the court - had rode and attempted to bring the statue down before. TJ even called him "Mr. Fifth," not understanding his last name was Third. In the latter episode, it is revealed that he leaves one-hundred dollar notes around the Unnamed City. He does this to award those who bring him back the notes with even bigger prizes.
Father: Thaddeus T. Third IV
Mother: Unknown mother
Grandfather: Thaddeus T. Third III
Friends: Miss Finster, Principal Prickly, Miss Grotke, TJ Detweiler, Vince LaSSao, Ashley Spinelli, Gretchen Grundler, Mikey Blumberg, Gus Griswald, Randall Weems, Menlo and other Third Street School students
Enemies: Earwin Lawson, Gelman, Conrad Mundy, Greg Skeens, Sue Bob Murphy, Lazy Kid, Chucko Kowalski, Jocko, Buster, Cheay, Koreo and Kurst the Worst
Likes: Behaving children and making sure troublemakers behave, particularly Lawson,
Dislikes: Misbehaving children, students getting him arrested, being mocked by troublemakers, being robbed by troublemakers, being insulted by troublemakers, getting his money stolen by troublemakers and children being treated like criminals