Ron Weasley, in particular ... Nagini is Voldemort's pet snake and also one of Voldemort's Horcruxes. Once Voldemort realized that Harry knew about the Horcruxes and that he was destroying ...

Ron Weasley is one of Harry Potter's best friends ... the cat had already tried to attack Ron's pet rat, Scabbers. Once Hermione bought Crookshanks and took the cat along with her to Hogwarts ...