He was affectionate with those he liked and acted as a shield to Sirius when Harry Potter was planning to kill him. He eventually came to like Harry and would sit on his lap occasionally, as he did in the summer of 1996. However, he could be moody towards those who threw him off their lap, no matter if it was accidental or deliberate.

Harry Potter and the Prisoner of Azkaban, Chapter 17 ( Cat, Rat and Dog) - " But Harry had just seen — slinking towards them, his body low to the ground, wide yellow eyes glinting eerily in the darkness — Crookshanks." During the height of the Second Wizarding War, Hermione and Crookshanks came to stay at the Burrow, but Hermione left with Harry and Ron after Bill Weasley and Fleur Delacour's wedding reception was interrupted by Death Eaters. [18] Crookshanks's type of cat's face is known as a "pansy face". Based on these markings, Crookshanks would have the characteristics of a hansa Himalayan, or ginger Himalayan cat. He could also be a Persian, but due to his face shape the former is more probable. Many people get these breeds confused. The Persian has larger, buggier eyes and rounder upper lips than a Himalayan. Evanna Lynch, who plays Luna Lovegood in the film series, named her cats after Harry Potter characters: she has a cat named Luna and another named Dumbledore. She also had a cat named Crookshanks, although it is now deceased. [22] Harry Potter and the Half-Blood Prince, Chapter 14 ( Felix Felicis) - " Crookshanks trotted after her, his yellow eyes fixed upon Arnold."

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In the Harry Potter and the Prisoner of Azkaban book, Crookshanks was bought by Hermione while Harry and Ron were looking for Scabbers. In the film, this scene was omitted and he was first seen chasing Scabbers when Harry left his room in The Leaky Cauldron. Ron later referred to him as a "bloody beast" and a "pig with hair". He had a fondness of chasing Wizard Chess pieces and had to occasionally be restrained in their presence. He was wary of Fanged Frisbees and hissed when one came near him. At a Gryffindor party, he took to following Ginny around, his yellow eyes fixed upon her new Pygmy Puff Arnold. There's something funny about that animal! It heard me say that Scabbers was in my bag!" — Ron after one of Crookshanks' failed attempts to catch Scabbers [src] Q.6 Does Harry Potter still have his owl (Hedwig) and does Hermione still have her cat (Crookshanks)? - JKR A plush version of Crookshanks is available at The Wizarding World of Harry Potter and at The Making of Harry Potter.

Clever Crookshanks, did you catch that all by yourself?" — Hermione Granger after Crookshanks caught a spider [src] Harry Potter and the Half-Blood Prince, Chapter 9 ( The Half-Blood Prince) - " Crookshanks's yellow eyes followed it and he hissed when it came too close."