Position 9: Ronald Weasley
After the victory over Voldemort, Kingsley Shacklebolt became the new Minister for Magic. To fight the remaining Death Eaters, he hired some allies who had already proven themselves in the fight against Voldemort. This included Ron.
This is how Ron was able to become an Auror without ever having graduated from school. But of course, experience speaks for itself. Ron not only fought alongside Harry against Voldemort for many years, but even destroyed a Horcrux himself.
After a few years as an Auror, Ron changed professions and joined his brother George’s joke shop. Nevertheless, he has proven to be a tenacious adversary against the Dark Arts, which is why he lands in 9th place in this ranking.
