Study Guide

The Great Brain Characters

By John D. Fitzgerald

Tom Dennis Fitzgerald, a.k.a. The Great Brain

Anyone who nicknames himself the Great Brain and constantly refers to his "great brain" (no...

John Dennis Fitzgerald, a.k.a. J.D.

J.D. is our narrator, and also Tom's younger brother. Looking up at Tom, J.D. admires him even as...

Sweyn Dennis Fitzgerald

The eldest of the Fitzgerald boys, Sweyn is going on twelve. While he still plays with Tom and...

Mamma (Tena Fitzgerald)

As was common for middle-class women in 1896, Mamma's job is to care for her home and family. As...

Papa

Papa is the editor of the town newspaper, the Adenville Weekly Advocate. J.D. explains: I thought...

Aunt Bertha

Aunt Bertha is the extra member in the Fitzgerald household: "She wasn't really our aunt, but we...

Other Important Adults

Uncle Mark is married to Papa's sister, Aunt Cathie. He is the town marshal and a deputy sheriff,...

Neighborhood Kids

The target of the Great Brain's final scheme, Andy is also the reason for the Great Brain's...

Animals

Brownie is J.D.'s dog: "Brownie was the only dog we had ever owned who wasn't a mongrel. He was a...

Minor Characters

Aunt Cathie is Papa's sister, but she appears in the book only once and never says a word. She is...

Very Minor Characters

Dave Teller is the shoemaker.Fred TannerFred Tanner runs the livery station.Irene Olsen and...