You probably don't like Nagini, because you think she's a Voldemort supporter. But you're wrong. When Nagini was a human, she was kind and nice. But I think when she became Voldemort's horcrux, it turned her evil. Remember how Ron and Ginny reacted when they were close to Voldemort's horcruxes? Imagine having Voldemort's soul inside you. Also, Voldemort controlled her using Parseltongue. How can you blame her now? .