Fifth book
Kreacher tries to save many Black family heirlooms from being thrown out in the cleaning of Grimmaud Place. He is known to mutter insults under his breath. He leaves the Black house when Sirius tells him to "get out", and visits Narcissa Malfoy. Kreacher then lies to Harry Potter about Sirius' whereabouts to encourage him to go to the Department of Mysteries.
 Sixth book
Harry learns that he has inherited Kreacher along with Number 12, Grimmaud Place after the death of Sirius Black. At Albus Dumbledore's suggestion, Harry sends Kreacher to Hogwarts to work in the kitchens.
Harry becomes convinced that Draco Malfoy is up to something and decides to have Kreacher tail him. Kreacher arrives wrestling Dobby, and is generally unwilling to help Harry although he is forced to due to his being Harry's house-elf.
 Final book
 Portrayals within films
 Outward appearance
"Except for the filthy rag tied like a loincloth around its middle, it was completely naked. It looked very old. Its skin seemed to be several times too big for it and though it was bald like all house-elves, there was a quantity of white hair growing out of its large, batlike ears. Its eyes were a bloodshot and watery gray, and its fleshy nose was large and rather snoutlike"
 Magical accomplishments and skills
He possesses elf magic, which is very different from wizard magic.
- ↑ J. K. Rowling, OotP 6