- Harry Potter orphaned at one and lives with his aunt and uncle; learned he was a wizard on 11th birthday; has a lightning shaped scar on his forehead from his encounter with You-Know-Who
The Muggle World
- Muggle a person with no magical powers
- Vernon, Petunia, and Dudley Dursley Harry's mother's sister and her family who Harry is sent to live with
The Weasleys
- Mr. Arthur Weasley recently promoted to head the department of the Office of Dectection and Confisication of Conterfeit Defensive Spells and Protective Objects
- Mrs. Molly Weasley housewife
- Bill Hogwarts graduate (former Head Boy), now works for Gringotts in Egypt
- Charlie Hogwarts graduate (former Gryffindor Quidditch star), now studies dragons in Romania
- Percy Hogwarts graduate (former Head Boy and Gryffindor prefect); now deputy to the Minsiter of Magic
- George and Fred mischeif making twins with incredibly good humor, run their own joke shop after leaving Hogwarts early
- Ron Harry's best friend, youngest male Weasley, lots of hand-me-downs, prefect
- Ginny youngest Weasley, has a crush on Harry, one year behind Ron and Harry at Hogwarts
Friends
- Rubeus Hagrid Good natured gameskeeper at Hogwarts, expelled in his third year for a crime he didn't commit, now also teaches the Care of Monsters course at Hogwarts
- Hermione Granger Harry's other best friend, born from Muggle parents, top of her class at Hogwarts, prefect
- Neville Longbottom Accident-prone friend and roommate of Harry and Ron
- Sirius Black best friend of Harry's parents and Harry's godfather; unfairly sent to Azkaban for twelve years; killed by his own cousin;
- Cedric Diggory befriends Harry when they compete together in the Triwizard Tournament
- Cho Chang Ravenclaw Quidditch Seeker Harry briefly dated
- Fleur Delacour French exchange student from Beauxbatons Academy who also befriends and competes with Harry; now engaged to Bill Weasley
- Viktor Krum Bulgarian exchange student from Durmstrang Insititute who befriends and competes with Harry; Star Seeker of Bulgarian Quidditch team
- Luna "Loony" Lovegood Ravenclaw student in Ginny's year who sees things differently than others; her father is the editor of the tabloid The Quibbler
Enemies
- Draco Malfoy classmate who hates Harry, Ron, and Hermonie; gets his laughs by insulting them
- Gregory Goyle large and slow sidekick of Malfoy
- Vincent Crabbe other large and slow sidekick of Malfoy
- You-Know-Who / He-Who-Must-Not-Be-Named aka Lord Voldemort Dark wizard who killed Harry's parents and many more, but failed to kill Harry; he and his supporters are Harry's biggest enemy and threat
- Dementor former guards of Azkaban prison that suck the happiness out of people and now allied with Lord Voldemort; said to be able to suck out a person's soul
- Death Eater Supporter of Voldemort's; the most notorious are Lucius Malfoy, Antonin Dolohov and Bellatrix LeStrange
- Fenrir Greyback A werewolf who enjoys seeking out children to bite; attacked Bill in a recent fight
Ghosts
- Nearly Headless Nick Gryffindor ghost who helps and is friends with the students in Gryffindor. His beheading in 1492 was muddled and didn't cut through completely.
- Bloody Barron Slytherin ghost who all the other ghosts are afraid of
- Peeves Poltergeist who thrives on making trouble and observing chaos
- The Fat Friar Hufflepuff ghost
- Moaning Myrtle Depressed teenage girl who haunts a girls' bathroom; has a crush on Harry
The Professors
- Dumbledore Headmaster of Hogwarts, considered to be the greatest wizard of all time, only one You-Know-Who is afraid of, very kind
- Snape head of the Slytherin house, teaches Potions (Defense in Harry's 6th year), hates Harry
- McGonagall head of Gryffindor house, teaches Transfiguration, deputy Headmistress of Hogwarts, very strict
- Binns the only ghost teacher, they say he got up to teach one day and left his body behind, teaches the History of Magic
- Qurriell former Defense Against the Dark Arts teacher, became a "body" for You-Know-Who and was left to die
- Lockhart former Defense Against the Dark Arts teacher, his Memory Charm backfired and erased his memory, popular author
- Lupin former Defense Against the Dark Arts teacher, helps Harry learn to defend himself against the dementors; one of Harry's dad's best friends;
- Moody former Defense Against the Dark Arts teacher; came out of retirement from his career as an Auror to teach at Hogwarts for a year; has a magical eye and is obsessed with the idea that everyone is out to kill him
- Umbridge former Defense Against the Dark Arts teacher; appointed by the Ministry and is determined to take over the school; very corrupt
- Slughorn retired Hogwarts Potions teacher who returns to the post in Harry's 6th year; hosts the "Slug Club" which is made up the students he feels will be most worth knowing in the future
- Sprout Herbology teacher, Head of Hufflepuff House
- Flitwick very short teacher of Charms, stands on a pile of books in order to be seen by the class, head of Ravenclaw House
- Madame Pomfrey nurse
- Madame Hooch flying teacher, main Quidditch referee
- Trelawney eccentric Divination teacher always trying to tell people's fortunes; convinced Harry is always near death; (her "gift" is) not respected by many students and teachers
Animals
- Scabbers Ron's hand-me-down rat who does nothing but sleep
- Hedwig Harry's owl, an 11th birthday present from Hagrid
- Errol Weasley Family's very old owl, often becomes unconsious during long flights
- Norbert the dragon that Hagrid hatched illegally
- Buckbeak friendly hippogriff who was lined up for execution for biting Malfoy; escaped with Sirius and now goes by the name Witherwings
- Blast-Ended Skrewts Hagrid's own breed of animal; shoot fire out of their butts
- Crookshanks Hermione's huge ginger cat
- Pigwidgeon Ron's tiny excitable owl
- Hermes Percy's owl
- Arnold Ginny's Pygmy Puff
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