Susan Carol is a confident and mature 13-year-old aspiring journalist who works alongside Stevie during the championship event. She uses her charm and intelligence to navigate the challenges they face.

Chip is a star college basketball player for Minnesota State, who becomes central to the mystery Stevie and Susan Carol attempt to solve. His character is initially mysterious, and he works closely with the young reporters.

Wojenski is a former dean associated with Minnesota State, whose character plays a pivotal role in the unfolding mystery.

Jurgensen is perceived as a threatening figure but ultimately becomes an ally to Stevie and Susan Carol. His character's evolution is central to the plot's mystery.

Whiting is a professor and the faculty representative for Minnesota State's athletic department, involved in the scheme affecting Chip.

Feeley is a wealthy individual whose financial issues lead him to be involved in the storyline's intrigue.

Kornheiser is a real-life sports journalist whose fictionalized version in the story interacts with Stevie, reflecting themes of journalism and media.

Coach K is the real-life Duke coach depicted in the story, offering an insight into the contrast between perception and reality.

Vitale is a real-life sports personality characterized by his exuberant and larger-than-life persona.

Weiss is a real-life sportswriter acting as a mentor to Stevie during the championship.

Brill is another real-life sportswriter who mentors Susan Carol, supporting her understanding of college basketball.

Thomas is Stevie's supportive father who accompanies him on the trip and offers guidance on his interactions with Susan Carol.

Anderson is Susan Carol's father, a minister, who is supportive and trusting of his daughter's endeavors.

Koheen is the president of Minnesota State, whose aspirations make him a key figure in the narrative.

Applebaum is an FBI agent representing law enforcement figures in the story.

Gary is Feeley's assistant whose character adds an element of unpredictability to the unfolding events.

Alan is Chip's father and coach of Minnesota State, whose integrity is important to Chip and the story's developments.