Wizard-in-training ron weasley helps his friend harry potter destroy lord voldemort. Scabbers the rat is often considered to be quite useless. Ron weasley, the red-haired and very funny guy, is harry's first friend at hogwarts. Ron is an important ally to harry throughout his years at school and plays a major role in his plan to destroy lord voldemort. Scabbers the rat, on the other hand, is generally considered to be rather useless