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Fawkes is Albus Dumbledore's pet phoenix, a mythological bird which cyclically bursts into flame upon its death and is then reborn from the ashes. Phoenix tail feathers are suitable for inclusion in some wands (both Harry and Voldemort's wands contain a feather from Fawkes's tail, the only two he ever gave) and their tears have healing powers. Fawkes can also teleport himself and others in a burst of flame.
In Chamber of Secrets, Harry's display of loyalty to Dumbledore results in his summoning Fawkes to his aid against Salazar Slytherin's Forbidden Forest. Having carried Harry to safety on his back, Firenze quarrels with other centaurs who object to the symbolic suggestion that centaurs are subservient to humans.
The character does not make another appearance until Order of the Phoenix, in which he is appointed by Dumbledore to teach Divination at Hogwarts in place of Sybill Trelawney, who has been sacked by Dolores Umbridge. For this, he is ostracised by his fellows. In Half-Blood Prince, he shares teaching duties with a reinstated Trelawney.
In Deathly Hallows, he is seen near the end of the book alongside the other members of the Hogwarts staff, against Voldemort and his Death Eaters; it is mentioned that he was wounded on his flanks by the Death Eaters but ultimately survived the Battle. Although not mentioned in the series, Rowling revealed that Firenze's herd is later forced to acknowledge that Firenze's pro-human leanings are not shameful, and allowed him to rejoin them.
The character is based on Steve Eddy, Rowling's former English teacher, who attempted to discourage her from writing fantasy tales. His name is the Italian form of Florence.
Frank is a thunderbird that was kidnapped and trafficked to Egypt in the 1920s. In the film Fantastic Beasts and Where To Find Them, Frank is the reason Newt went to America. After rescuing Frank from the traffickers, Newt stored Frank with his other magical creatures in his suitcase. Newt brings Frank to America in hopes of returning him to his native land of Arizona.
In the climax of the film, the existence of magic is revealed to the people of New York City, following a battle between American wizarding government MACUSA and an obscurial. Knowing the secrecy of wizard-kind has been compromised, Newt releases Frank from his suitcase and gives him a potion that has memory wiping properties. Because of the thunderbird's ability to generate storms, Newt says goodbye to Frank as Frank flies into the sky, creating a rainfall using the liquid from the potion, erasing the memories of all non-magical people of the event.
Rowling revealed in a tweet following the film's release that Frank did indeed make it back to Arizona following the events of the film.
Griphook is a goblin and an employee at Gringotts until the Second Wizarding War. In Philosopher's Stone, after Hagrid presents Harry's key and Dumbledore's letter to an unnamed goblin in the Gringotts lobby, Griphook is called to escort Harry and Hagrid through the underground rail-system to Harry's vault, and afterwards to Vault 713 to retrieve the Philosopher's Stone. He is not heard of again until Deathly Hallows, when the Snatchers holding him captive also capture Harry, Ron, and Hermione. When Hermione lies under torture to Bellatrix Lestrange that the sword of Gryffindor is a fake, Bellatrix asks Griphook for confirmation, which she receives. He is saved, along with Harry, Ron, and Hermione, by Dobby and successfully escapes to Shell Cottage. Because Harry needs to take a Horcrux from Bellatrix's vault, Griphook reluctantly agrees to help them break into Gringotts, in exchange for the sword of Gryffindor; but when escaping, Griphook betrays them to the other goblins and escapes with the sword. His fate is left unknown in the book, but in the film he is shown dead during the aftermath at Gringotts, and Gryffindor's sword vanishes before Voldemort can see it. In spite of Griphook's insistence that the sword belongs to the goblins, the sword reappears when Neville Longbottom pulls it from the Sorting Hat and beheads Nagini.
Hedwig is Harry Potter's owl, given to him in Harry Potter and the Philosopher's Stone as an eleventh birthday present by Rubeus Hagrid, who purchases the owl in Diagon Alley at the Eeylops Owl Emporium. Harry gives her this name after reading it in a book on the history of magic. Hedwig is used for delivering messages throughout the series, and also serves as a companion to Harry, especially when he is unable to interact with other wizards. It is implied throughout the books that Hedwig can fully understand Harry's speech. In the fifth book, Order of the Phoenix, Hedwig is intercepted by Dolores Umbridge and is hurt, but is later healed by Professor Grubbly-Plank. In the seventh book, The Deathly Hallows, Hedwig is killed by a curse from a Death Eater; in the film version, she is killed defending Harry from the Death Eater. According to Rowling, Hedwig's death represents the loss of Harry's innocence.
Although the character of Hedwig is female, she is played on film by male owls (female snowy owls have dark patches of plumage, while only the males are completely white). The John Williams composition which serves as title music for the entire film series is named "Hedwig's Theme".
Hokey is a house-elf who works for Hepzibah Smith, an old woman deceived by Tom Riddle into showing him Slytherin's locket and Hufflepuff's cup, which he uses as two of his Horcruxes. Hokey's memory allows Harry and Dumbledore a glimpse of the visit Voldemort makes two days before Hepzibah Smith is poisoned and both treasures disappear; whereafter Riddle, who magically tampers with Hokey's memories, frames Hokey for Hepzibah's murder. She does not deny the accusation and is convicted for accidental murder.
Kreacher is a house-elf who serves the House of Black for generations. His name is a pun on the word creature, indicating that his masters regarded him as an inferior. Kreacher first appears in Order of the Phoenix as an unwilling servant to Sirius Black. Kreacher disdains Sirius, mainly due to his devotion to his former masters (Regulus Black in particular), whose pure-blood values Sirius has rejected. Sirius also treats him harshly because the elf is a living reminder of a home to which he earlier had no intention of returning. Knowing too much of the Order of the Phoenix's activity, Kreacher is not allowed to leave Grimmauld Place. Kreacher has lived alone in the house for years with only the screaming portrait of Mrs. Black for company. Despite obeying Sirius, he is insolent and rude, insulting in undertones all present who he refers to as "Blood traitors, Mudbloods and scum". Kreacher desires to leave Sirius and serve his next of kin, Bellatrix Lestrange and the Malfoys. He betrays Sirius and persuades Harry to go to the Department of Mysteries, where a trap has been laid. Sirius is killed by Bellatrix in the ensuing combat, while trying to save Harry. Following Sirius's death, Harry inherits all Sirius's possessions, including a highly unwilling Kreacher. Harry immediately orders him to work at Hogwarts, where he comes to blows with Dobby about his lack of loyalty to Harry.
In Deathly Hallows, Harry and his friends coax from the house-elf the current whereabouts of Salazar Slytherin's Locket, a Black heirloom and one of Lord Voldemort's Horcruxes; whereafter Harry sends Kreacher to retrieve the locket from Mundungus Fletcher and gives him its substitute as a token of remembrance (referring to Regulus Black, who alone treated Kreacher with respect). Thereafter Kreacher appears cleaner and happier, and ceases to mutter insults under his breath. When Grimmauld Place is infiltrated by Death Eaters, Harry decides against calling the elf back to them, fearing possible betrayal. In the Battle of Hogwarts, Kreacher rallies the Hogwarts house-elves against the Death Eaters. It is implied that he survived the battle, as Harry wonders 'whether Kreacher will bring him a sandwich' after his battle with Voldemort.
Kreacher appears in the film version of Harry Potter and the Order of the Phoenix, voiced by Timothy Bateson. Producers admitted they had wished to cut the character from the film, but when Rowling was consulted, she advised: "You know, I wouldn't do that if I were you. Or you can, but if you get to make a seventh film, you'll be tied in knots." In Harry Potter and the Deathly Hallows – Part 1, Kreacher is voiced by Simon McBurney, as Timothy Bateson had died.
Voldemort is able to communicate with Nagini due to his ability to speak Parseltongue, the language of snakes. Nagini is first sighted when the snake alerts Voldemort to the presence of an eavesdropping Frank Bryce, an old gardener who had worked for the Riddle family. During the fourth year Harry spends at Hogwarts, Voldemort's temporary body is sustained by Nagini's venom, harvested by Peter Pettigrew. In Harry Potter and the Order of the Phoenix, Harry assumes Nagini's viewpoint during her attack on Arthur Weasley in one of his dreams; Albus Dumbledore believes this an effect of Harry's special connection to Voldemort, with Harry's witnessing the attack by virtue that Voldemort's mind "happened to be" in Nagini at the time. This is the first indication of Nagini and Voldemort's deeper connection, having the ability to share thoughts and connect with Harry.
In Deathly Hallows, Nagini consumes Charity Burbage, a Hogwarts Muggle Studies professor, after the Killing Curse is used on her. Nagini is later placed inside the corpse of Bathilda Bagshot by Voldemort, to enable a surprise assault on Harry when he visits Godric's Hollow. Because some snakes (pit-vipers and pythonids) can sense heat and movement in a way humans cannot, Nagini is able to detect Harry and Hermione even when they are under the Invisibility Cloak. After discovering that Harry is searching for his Horcruxes, Voldemort places Nagini into a protective magical cage to prevent her from being killed, but uses her to kill Severus Snape by expanding the cage over him. When Harry is apparently killed by Voldemort, Nagini is released from the protective enchantment and is draped around Voldemort's shoulders during the Death Eaters' victory march back to Hogwarts. After Neville Longbottom openly defies Voldemort, Voldemort punishes him by forcing the Sorting Hat on his head and setting it on fire. The Death Eaters are then attacked and a battle ensues, and Neville pulls Godric Gryffindor's sword from the Hat, as Harry had done in Chamber of Secrets, and beheads Nagini. In the film, Nagini is instead protected by a force field and participates in the final battle as opposed to dying before it began, her fate however is the same as in the book.
Voldemort made Nagini his final Horcrux when he was hiding in the forests of Albania by murdering Bertha Jorkins; but Dumbledore suspected that Nagini was made by Voldemort killing Frank Bryce. Due to this connection, Voldemort has complete control over the snake, even for a Parselmouth, as mentioned by Dumbledore in Half-Blood Prince. Nagini was also able to inform Voldemort about the presence of Harry in Godric's Hollow.
Peeves is a poltergeist who causes trouble in Hogwarts, and is therefore often pursued by Argus Filch. He is capable of flight and can choose whether to be tangible; and is able to manipulate objects, a trait not generally possible with ghosts, but common among poltergeists. Peeves's existence is essentially the embodiment of disorder, which he is observed to constantly cause. In appearance, he is a small man with a mischievous face and a wide mouth, dressed in vibrantly coloured clothing. He derives joy from disaster and mischievous acts, usually causing disruptions to daily activity.
Peeves only listens to a select few: Dumbledore; the Bloody Baron; in the second book Nearly Headless Nick; and in the fifth book, Fred and George Weasley. Filch, who is usually left with cleaning up the mess and damage that Peeves causes, tries repeatedly to remove him; however, Rowling has stated in an interview that not even Dumbledore would be able to rid Hogwarts of Peeves forever. Peeves is vulnerable to some magic; in Prisoner of Azkaban, Professor Lupin uses magic to teach Peeves a lesson by making the gum Peeves was stuffing into a keyhole enter the poltergeist's nose. In Harry Potter and the Half-Blood Prince, Harry uses magic to attach Peeves's tongue to the roof of his mouth, after which Peeves angrily departs.
During Dolores Umbridge's attempts to take control of Hogwarts in Order of the Phoenix, Peeves begins a rampage at the Weasley twins' request. When Umbridge attempts to sneak out of Hogwarts, Peeves chases her out, whacking her with Minerva McGonagall's cane (which she lent to him for that purpose) and a sock full of chalk. Peeves is twice depicted at the conclusion of Deathly Hallows: initially attacking Death Eaters with vicious plants and subsequently singing a victory song for Harry.
It is also implied that Peeves was still at Hogwarts at the time of the epilogue, since Harry tells his son Albus Severus not to "mess with Peeves".
Rik Mayall was cast as Peeves for the film adaptation of Philosopher's Stone, but his scenes were cut from the final film and do not even appear in the deleted scenes section of the DVD release. Peeves was subsequently omitted from the Harry Potter films that followed, though he can be seen in the video games.