8. The Koopa Troop
Say what you want about Bowser's military division, those guys have serious staying power. No matter how many times Mario defeats them, (and even a quick scan through a list of Mario titles will show you that he's done this a lot) they always come back for more. Not only that, but Bowser seems to somehow have recruited a seemingly endless force of troops; a sign that he must be doing something right.
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