The protagonist of the novel. He is a typical young boy, about ten years of age, who is full of mischief, imagination, and activity.
A friend of Tom’s, who is about his same age. As the son of the town drunk who has abandoned him, he is allowed to live the life of a vagabond and is the envy of all the other boys in town who are made to wash themselves, help with chores, attend school, and obey.
A dangerous half-breed Indian that is Tom’s antagonist in the story. When Tom and Huck see the Indian murder Dr. Robinson, they are afraid that Joe will punish them as well.
The wealthy daughter of a judge with whom Tom falls in love. She is a blond, blue-eyed beauty.
Tom’s aunt and guardian. She is the soft-hearted sister of Tom’s dead mother and feels very responsible for raising Tom correctly.
Tom’s half-brother who is called Sid and who also lives with Aunt Polly, sharing a room with Tom. As an obedient, tattling, and deceitful boy, he is a constant source of grief to Tom.
Tom’s kind cousin who lives with him at Aunt Polly’s house and who tries to guide and protect Tom.
The widow of the Justice of Peace who "adopts" Huck Finn and plans to civilize and educate him.