Kreacher is a house-elf from the Harry Potter series, created by author J.K. Rowling. He serves the Black family and is known for his grumpy demeanor and loyalty to his former masters. Kreacher has a strong connection to Number 12, Grimmauld Place, the ancestral home of the Black family. Throughout the series, Kreacher's character evolves as he interacts with Harry Potter and his friends. Initially resentful and bitter, he gradually becomes more cooperative and even helpful, showcasing themes of redemption and the complexity of loyalty in the wizarding world.