Bradford Buzzard of course.

Bradford is not a villain, he is an antagonist

(tried to make sentence sound funny, did it work?)

Bradford is a villain. He tell to Della about Spear of Selene, he was a villain with organise, without know it Scrooge. Bradford is the best villain in the series.

Taurus Bulba is only simple villain. No like Lunaris.

Magica isn't pure evil I don't think.