Kreacher

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Kreacher is a fictional magical creature in the Harry Potter book series by J. K. Rowling and the Warner Bros. film series. He is an aged house-elf, sworn to serve the Black family. When Sirius Black (the last surviving Black) is killed, Kreacher becomes the servant of Harry Potter, per Sirius's will. Not wanting the house-elf, Harry orders Kreacher to Hogwarts to work in the kitchens.

 

Kreacher served the Noble and Most Ancient House of Black for decades prior to his first appearance in Harry Potter and the Order of the Phoenix. In the book, after the death of his mother Walburga, Sirius Black inherits Kreacher.

Kreacher was an unwilling servant to Sirius, mainly due to his devotion to his former masters (Regulus Black in particular, who had treated him well), but also because of Sirius's rather harsh treatment (because to him, Kreacher was a living reminder of a home he had had no intention of returning to). The house-elf therefore more or less openly expressed his dislike for his master and his guests at any opportunity - despite Hermione's attempts to befriend him - and his desire to leave and serve the next pure-blooded kin of the Blacks, the Malfoy Family and Bellatrix Lestrange. Due to this and the fact that he knew too much of the Order of the Phoenix, however, he was not allowed to leave the house. His grumpiness about his general situation caused him to neglect his house-keeping duties severely. Furthermore, years of being isolated in the house alone, with only the screaming portrait of Mrs. Black for company, caused him some mental instability, in which he seemed to speak his personal thoughts and feelings aloud, completely unaware of doing so.