Hogwarts Headmaster concerned about the Dementors stationed at school. Trusts his teachers...

Ravenclaw third-year student in Harry's year, intelligent and studious.

Collectible card featuring a famous wizard that comes with Chocolate Frog sweets.

Second-year Gryffindor who idolizes Harry Potter and constantly takes photographs.

Ghost professor who teaches History of Magic in the most boring way possible.

Slytherin third-year student, quieter than most of her housemates but still pure-blood supremacist.

Third-year Gryffindor student and Harry's dormmate. Interested in football and gets along well with...

Supernatural frost that appears when Dementors are nearby, making everything cold and miserable.

The lead Dementor that boards the Hogwarts Express, particularly drawn to Harry.

Hooded, soul-sucking creatures guarding Hogwarts to catch Sirius Black. Drain happiness and hope...

Colin's younger brother, also a Gryffindor who admires Harry greatly.

Hufflepuff third-year student, pompous but well-meaning and loyal to his friends.

One of the new first-year students sorted into Hufflepuff House.

Various ghosts who visit the Great Hall during meals and special occasions.

Hufflepuff third-year student, pink-faced and kind-hearted girl who is easily flustered.

Faints when Dementors board the Hogwarts Express. Saved by Professor Lupin who teaches him about...

Third-year student taking an unusually heavy course load. Seems to be everywhere at once.

Magical railway employee who operates the Hogwarts Express train service.

Hufflepuff third-year student from a wealthy Muggle family, well-spoken and friendly.

Ravenclaw student in Harry's year, intelligent and studious like most of her house.

Ravenclaw student known for her academic excellence and participation in class discussions.

Hufflepuff girl in Harry's year, friendly and helpful to her fellow students.

Ravenclaw third-year student who shares classes with Harry and his friends.

Large Slytherin third-year girl, aggressive and unpleasant like most of her housemates.

Transfiguration professor and Head of Gryffindor House. Strict but caring teacher who worries about...

Slytherin third-year student with a pug-like face, devoted follower of Draco Malfoy.

Seventh-year Gryffindor and Head Boy. Very ambitious and rule-following, takes his prefect duties...

New Defence Against the Dark Arts teacher. Shabby but kind wizard who saves Harry from the...

Harry's best friend, now in his third year. His rat Scabbers seems ill and keeps trying to hide.

Hogwarts student in Harry's year, house unknown but present in shared classes.

Ron's pet rat who seems sickly and nervous. Has been with the Weasley family for twelve years....

Third-year Gryffindor student and Harry's dormmate. Irish accent and tendency to cause small...

Gryffindor House ghost whose head is nearly severed. Friendly ghost who welcomes students back to...

Ravenclaw student in Harry's year, quiet but observant member of his house.

Hufflepuff third-year student with red hair, niece of Amelia Bones from the Ministry.

Ravenclaw third-year student, known for his quick wit and academic prowess.

Slytherin third-year student, quiet and solitary member of Draco's year.

Magical creatures mentioned in Care of Magical Creatures class, visible only to those who've seen...

Friendly witch who sells sweets and snacks on the Hogwarts Express train.

Hufflepuff student in Harry's year, loyal and hardworking like his housemates.

Eccentric neighbor of the Dursleys who owns many cats, mentioned as Harry's occasional babysitter.

Hogwarts caretaker who patrols the corridors with his cat Mrs. Norris. Grumpy and eager to punish...

Head administrator of Azkaban prison, responsible for overseeing the Dementor guards.

Dangerous Death Eater and Sirius Black's cousin, mentioned as another notorious Azkaban prisoner.

Shopkeeper who sells cauldrons and potion-making equipment in Diagon Alley.

Minister for Magic who meets Harry at the Leaky Cauldron. Concerned about Harry's safety from...

Hermione's new pet - a large, ginger, half-kneazle cat with a squashed face. Very intelligent and...

Editor of the Daily Prophet who oversees coverage of Sirius Black's escape.

Harry's spoiled cousin who bullies him regularly. Large, stupid boy who is pampered by his parents.

One of the empty portrait frames throughout Hogwarts where portraits can visit and move between.

Elderly driver of the Knight Bus with thick glasses. Takes the bus on wild journeys through London...

One of the other dangerous prisoners mentioned as being held in Azkaban with Black.

Magical fireworks that create spectacular displays and are popular with students for pranks.

Tiny Charms professor and Head of Ravenclaw House. Excitable teacher who demonstrates spells with...

Owner of an ice cream parlor in Diagon Alley who serves Harry during his stay at the Leaky Cauldron.

Owner of the joke shop in Diagon Alley, competitor to Zonko's in Hogsmeade.

Wandmaker in Diagon Alley, remembers every wand he's ever sold including Harry's.

Massive squid living in the Hogwarts lake, generally peaceful but impressive.

Second-year Gryffindor and Ron's younger sister. Shy around Harry but brave and determined.

Large, dim-witted Slytherin student who acts as Draco Malfoy's other bodyguard.

One of the goblin tellers at Gringotts Bank who handles wizarding currency.

Harry's loyal snowy owl who delivers his mail and provides companionship.

One of the many owls that live in the Owlery and deliver mail for students without pets.

One of the many suits of armor that line Hogwarts corridors, some of which are enchanted to move.

Magical letter that screams its message aloud, mentioned as punishment mail.

Auror involved in the hunt for Sirius Black, competent but not exceptional.

Senior Auror mentioned in connection with the search for Sirius Black.

One of the magical beds on the Knight Bus that slides around during the wild journey.

Suspicious wizard lurking in Knockturn Alley, dealing in dark magical items.

Witch who works at the Leaky Cauldron, serves drinks and meals to customers.

Owner of Madam Malkin's Robes for All Occasions, outfits Hogwarts students.

Vernon's sister who breeds bulldogs. Nasty woman who insults Harry's parents, causing Harry to...

Professor McGonagall's Animagus form as a tabby cat, occasionally seen around grounds.

Ministry official assigned to protect Minister Fudge during his meeting with Harry.

Ministry employee whose job is to modify Muggle memories of magical incidents.

Filch's mangy grey cat who helps patrol Hogwarts corridors. Seems to understand human speech and...

Nosy neighbor of the Dursleys who gossips about the family's business.

Mischievous poltergeist who haunts Hogwarts. Causes chaos and mayhem, dropping things on students...

Harry's aunt and Lily's sister. Thin, horse-faced woman who resents Harry and tries to suppress his...

Herbology professor and Head of Hufflepuff House. Kindly witch who teaches students about magical...

One of the many portrait ladies throughout Hogwarts who gossip and observe student activities.

Owner of the Quidditch supply shop in Diagon Alley, knowledgeable about flying equipment.

Magical device that glows red when the holder has forgotten something, mentioned in passing.

Aunt Marge's favorite bulldog who once attacked Harry. Aggressive dog that reflects his owner's...

Daily Prophet reporter mentioned in connection with sensational stories about Sirius Black's escape.

Troll mentioned as part of Hogwarts' enhanced security measures during Black's escape period.

One of the older Gryffindor students who helps maintain house traditions and order.

Jamaican shrunken head that announces Knight Bus stops and destinations.

Leader of the Headless Hunt, a group Nearly Headless Nick wants to join but can't due to his...

Dangerous wizard who escaped from Azkaban prison. First wizard ever to break out of the supposedly...

Magical device mentioned as detecting untrustworthy people and Dark Magic.

Conductor of the Knight Bus, around eighteen years old with protruding ears. Chats with Harry about...

Slytherin House ghost covered in silver bloodstains, the only being Peeves fears.

Hufflepuff House ghost, jolly and kind-hearted friar who welcomes students warmly.

Portrait who guards the entrance to Gryffindor Tower. Likes to sing opera and requires the password...

Ravenclaw House ghost, tall and beautiful but distant and aloof.

Required textbook for Care of Magical Creatures that tries to bite anyone who opens it.

Toothless innkeeper of the Leaky Cauldron who welcomes Harry. Concerned about his safety from...

Mysterious Ministry employee from the Department of Mysteries, mentioned in connection with magical...

Harry's uncle and guardian. Large, beefy man who works at a drill company and despises anything...

Large, stupid Slytherin student who serves as one of Draco Malfoy's bodyguards.

Portrait of a lady in a violet dress who gossips with other portraits about student activities.

One of many wizard portraits throughout Hogwarts who observe and comment on castle activities.

Radio broadcaster on the Wizarding Wireless Network who announces news and programs.

Radio journalist reporting on Sirius Black's escape and the Ministry's response.