Here you can find most important magic creatures that appeared in the books and movies:
ATTENTION! THIS MAY CONTAIN SPOILERS FROM THE MOVIES
Acromantula
An Acromantula is a species of giant spider, native to the rainforests of Southeast Asia, particularly Borneo where it inhabits dense jungles. Acromantulas are believed to be a wizard-bred species, designed to guard dwellings or treasure hoards, and were first created before the Ban on Experimental Breeding in 1965. These giant spiders with a taste for human flesh were first spotted in 1794.
A colony of Acromantulas was established in the Forbidden Forest at Hogwarts School of Witchcraft and Wizardry by Aragog and his mate, Mosag. Rubeus Hagrid originally kept a young Aragog in a cupboard box in the school’s dungeons. Aragog was released into the Forest by Rubeus Hagrid at about the time of the 1943 opening of the Chamber of Secrets.
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Basilisk
The Basilisk is a giant serpent, also known as the King of Serpents. It is a creature bred by Dark Wizards. Herpo the Foul was the first to breed a Basilisk; he accomplished this by hatching a chicken egg beneath a toad which resulted in the creature known as a Basilisk. Basilisk breeding was banned in Medieval times. The practise can be hidden when the Department for Regulation and Control of Magical Creatures comes to check by simply removing the egg from the toad.
Although classified as an XXXXX creature, meaning it is a known wizard-killer that cannot be domesticated due to its immense powers, because the Basilisk is still a serpent, a Parselmouth may place a Basilisk under his or her control. This depends on the relationship between the Basilisk and the Parselmouth, as Tom Riddle, alias Lord Voldemort, was the only one who could command Salazar Slytherin’s Basilisk, while Harry Potter had no control over it.
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When a victim looks indirectly at the Basilisk’s eyes, such as its reflection, they will merely become petrified, similar to the Medusa stare.
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Centaur
A Centaur is a magical creature whose head, torso and arms appear to be human and are joined to a horse’s body. They are, however, their own species, and are not any kind of half-breed.
Despite possessing ‘human intelligence’, centaurs are classified as Beasts by the Ministry of Magic, at their own request, as they were unhappy at having to share Being status with hags and vampires.
A Centaur Liaison Office still exists in the Ministry of Magic’s Department for the Regulation and Control of Magical Creatures, though no centaur has ever used it. In fact, the phrase “Being sent to the Centaur Office” has become an in-joke at the Ministry, meaning that the person in question is about to be sacked. A centaur was also represented in the Fountain of Magical Brethren at the Ministry of Magic, at least before the fountain’s destruction during the battle between Albus Dumbledore and Lord Voldemort.
Centaurs have also been known to save wizards from harm, one instance being Firenze saving Harry Potter, when Lord Voldemort was in the forest, though this was highly looked down upon as centaurs were not supposed to interfere with “what is to come.”
When Harry Potter and Hermione Granger ended up leading Dolores Umbridge into the Forbidden Forest, a group of centaurs appeared with some of them carrying off Dolores while the rest were scared away by Grawp in an event known as the Skirmish in the Forbidden Forest. It was mentioned that Albus negotiated for Dolores’ release when he was rehired by the Ministry of Magic.
The centaur herd in the Forbidden Forest also fought against the Death Eaters in the Battle of Hogwarts.
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Harry Potter and the Order of the Phoenix–The Centaurs
Dragon
Dragons are giant winged, fire-breathing reptiles. Widely regarded as terrifying yet awe-inspiring, they can be found all over the world and are frequently referred to in Asian and medieval European folklore.
Able to fly and breathe fire through their nostrils, they are one of the most dangerous and hardest to conceal creatures in the wizarding world. The Ministry of Magic classifies them as XXXXX, known wizard killers that are impossible to train or domesticate. Despite how dangerous they are, there are people who are trained to work with them, called dragon keepers, or dragonologists. A wizard who trades and sells dragon eggs (which is an illegal activity) is referred to as a dragon dealer.
The motto of Hogwarts School of Witchcraft and Wizardry is Draco dormiens numquam titillandus; Latin for Never tickle a sleeping dragon. The Hogwarts gamekeeper, Rubeus Hagrid, loved and adored dragons, briefly owning a Norwegian Ridgeback named Norbert, who turned out to be a female and was subsequently renamed Norberta. In 1993, the Minister for Magic, Cornelius Fudge, suggested placing dragons to guard the school, after being compelled to remove the Dementors, something that Professor Dumbledore thought Hagrid would be very happy with.
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Leprechaun
The Leprechaun, sometimes known as the Clauricorn, is a mischievous magical creature, although it is not malicious. They have a reputation as pranksters, but have never inflicted lasting damage on a Human. Native only to Ireland, they are fully sentient and capable of speech but have never requested the Ministry of Magic to reclassify them as Beings.
Ludo Bagman paid Fred and George Weasley in Leprechaun gold-galleons when he lost a bet concerning the Ireland and Bulgaria Quidditch teams during the Quidditch World Cup. Ron paid Harry in it as well to cover the cost of the Omnioculars that Harry got for him to view the match. Ron was very upset when he found out the gold disappeared, and that he hadn’t really paid back Harry at all, but Harry didn’t mind.
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Merpeople
Merpeople are sentient beasts that live underwater, and are found all over the world. Their customs and habits are mysterious, and, like the centaurs, were offered the being status but refused in favour of beast, as they didn’t want to be placed in a status with Hags and Vampires. Merpeople can breathe above the waves for a time, but it is unclear if they can ever truly leave their habitat.
A colony of merpeople lived in the Black Lake on the grounds of Hogwarts Castle. These merpeople played a role in the history of Hogwarts School, most notably consenting to be the major obstacles of the Second Task of the 1994 Triwizard Tournament.
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Three-Headed Dog
Three-headed dogs are very rare creatures. It is unknown if, like the Runespoor, each head serves a different purpose. Their great weakness is the inability to resist falling asleep to the sound of music.
Rubeus Hagrid once owned a three-headed dog named Fluffy, which he obtained from a Greek man he met at a pub. Fluffy served as one of the obstacles to the Philosopher’s Stone in 1992.
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Toads
Toads are ordinary, non-magical creatures popularly known among Muggles as well as wizards and witches. Toads are one of the three animals students at Hogwarts are allowed to have at the school along with owls and cats. The toad has been by far the least popular choice of pet, and Rubeus Hagrid said they went out of style years before 1991.
By the time Harry arrived at Hogwarts, possession of a pet toad conveyed neither cool nor status; indeed, it was something of an embarrassment. The toad, never much appreciated for its own personal appeal, gradually appeared (alive) less and less frequently at Hogwarts, unless hopping and swimming wild in the grounds. Neville’s pet toad, Trevor, had nothing to commend him except a propensity for getting lost, and when he slipped off to join one day his brethren toads living in the Black Lake, both owner and pet had a sense of relief.
Troll
A Troll is a magical creature of prodigious strength and immense stupidity. In fact, they are so stupid that they actually had a wizarding exam failing grade named after them. Trolls are grouped in the taxonomical genus Troglodytarum.
Troll language is nothing more than simple grunts that only Trolls seem to be able to interpret, though skilled magical multi-linguists such as Barty Crouch can understand them. Trolls understand only a limited number of Human words, and some smarter ones can be skillfully trained as security Trolls. Professor Quirrell had a gift for communicating with Trolls, and then used it to set one loose in Hogwarts School of Witchcraft and Wizardry in 1991 in an effort to steal the Philosopher’s Stone.
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Thestral
A Thestral is a breed of winged horses with a skeletal body, face with reptilian features, and wide, leathery wings that resemble a bat’s. They are very rare, and are considered dangerous by the Ministry of Magic. Thestrals are, undeservedly, known as omens of misfortune and aggression by many wizards because they are visible only to those who have witnessed death at least once or due to their somewhat grim, gaunt and ghostly appearance.
Due to Thestrals’ classification as XXXX, only experienced wizards (or Hagrid) should try to handle Thestrals. Breeding as well as owning these beasts may be discouraged or even illegal without Ministry consent; in fact, wizards that live in areas not protected against Muggles are forced by law to perform Disillusionment Charms on their Thestrals regularly.
A thestral is also one possible corporeal form of the Patronus Charm.
Are very capable and fast fliers and can travel long distances hardly beating their large wings. For example, in 1996, six members of the Hogwarts herd (ridden by Harry Potter, Hermione Granger, Ron Weasley, Ginny Weasley, Neville Longbottom, Luna Lovegood) were capable of flying from Hogwarts (Scotland) to the Ministry of Magic (London) in a brief amount of time. It is possible that they were faster than even the fastest broomstick, as when Harry rode his, he did not think he had ever moved so fast, and he was the owner of a top-of-the-line broomstick, the Firebolt.
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Harry Potter 