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HARRY POTTER: Orphan legendary in the wizard world for surviving an attack by evil sorcerer Lord Voldemort that killed his parents.
RON WEASLEY: Harry's mischievous, red-headed best friend and classmate at Hogwarts School of Witchcraft and Wizardry.
HERMIONE GRANGER: The boys' bossy, straight-A gal pal.
DRACO MALFOY: Harry's Hogwarts enemy.

MUGGLES
Ordinary, non-magical people, including Harry's guardians,
THE DURSLEYS: Anxious Uncle Vernon, snobbish Aunt Petunia and their spoiled, bullying son Dudley.

HOGWARTS FACULTY (Philosopher's Stone)
Potions professor Snape, Defense Against Dark Arts professor Quirrel, Deputy Headmistress Prof. McGonagall, Flying Instructor Madame Hooch.
RUBEUS HAGRID: Half-man, half-giant, soft-hearted Hogwarts groundsman.
ALBUS DUMBLEDORE: Hogwarts' wise, ancient headmaster.

ANIMAGUS
McGonagall: Cat
James Potter: Deer
Sirius Black: Black Dog
Rita Skeeter: Beetle
Peter Pettigrew: Ron's rat
Lupin: Werewolf