Attacks Draco Malfoy after Draco insults him. Draco claims to be badly injured.

Wardrobe in the Defense classroom that contains a boggart for teaching purposes.

Claims to be seriously injured by Buckbeak. Milks the injury for sympathy and attention.

Hagrid's large boarhound, cowardly despite his intimidating size.

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.

Teaching skeleton in the hospital wing used by Madam Pomfrey for medical instruction.

Third-year Gryffindor who is terrified of Professor Snape. Performs better in other classes.

Hogwarts matron who runs the hospital wing. Fussy but caring, treats Draco after his encounter with...

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.

Worried about Buckbeak after Draco's injury. Fears what the Ministry might do to his beloved...

Magical healer mentioned in connection with treating serious magical injuries.

Giant spider species mentioned as living in the Forbidden Forest, dangerous but intelligent.

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

Textbook for Ancient Runes class containing magical symbols and their meanings.

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

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...

Advanced textbook for Arithmancy class, full of complex magical calculations and formulas.

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

Ancient Runes professor who teaches students to read and interpret magical symbols.

Another hippogriff in Hagrid's Care of Magical Creatures class, less prominent than Buckbeak.

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

Small tree-dwelling creatures mentioned in Care of Magical Creatures class.

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

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

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

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...

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

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

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.

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

Historical wizard mentioned in Transfiguration class as expert in Switching Spells.

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...

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

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...

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

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

Pure magical creature living in the Forbidden Forest, mentioned in Care of Magical Creatures.

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.

Founder of Gryffindor House, mentioned in relation to house history and values.

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

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.

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

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

Magical railway employee who operates the Hogwarts Express train service.

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.

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

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.

Third-year Gryffindor student who takes Divination. Very interested in Professor Trelawney's...

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

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

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

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

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.

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...

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.

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

Third-year Gryffindor student who takes Divination. Very supportive of Professor Trelawney's...

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

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

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 many knight portraits throughout Hogwarts who challenge students to duels.

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.

One of the four founders of Hogwarts, mentioned in relation to Slytherin House traditions.

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

Ron's elderly pet rat who is terrified of Hermione's cat Crookshanks. Missing a toe on his front...

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

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

Arithmancy professor, teaches the mathematical side of magic to advanced students.

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

Jamaican shrunken head that announces Knight Bus stops and destinations.

Portrait of a knight with a fat pony who challenges people to duels. Brave but incompetent medieval...

Sir Cadogan's brave but sensible horse that often refuses his ridiculous orders.

Sir Cadogan's loyal but cowardly pony that appears with him in his portrait.

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

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...

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.

New Divination teacher with huge glasses and many shawls. Predicts death and doom dramatically but...

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

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.

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...

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

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

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.

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

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.