Jacob's sibling's cat, Harry Potter Wiki

This cat was acquired by Jacob's sibling before the pet gathering in the 1985–1986 school year and helped Fang overcome his fear of cats, a fear likely caused by Mrs Norris. Several cat varieties are available for purchase in the game. However, the player has to first purchase the cat with the default look before being able to select other varieties. This pet may be purchased before the quest begins, leading to some altered dialogue. Harry Potter: Hogwarts Mystery (First appearance)

Harry Potter and the Chamber of Secrets - Hermione accidentally adds cat hairs to her Polyjuice Potion…

A little bit of speculation what do you think Jacob's sibling (your character) is going to do with his life after Hogwarts? For me, I think he'll become a curse breaker traveling

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