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Mario addition
Mario has no idea how to tell the difference between an adult Koopa and Koopaling. So the first time he meets the Koopalings he's like "ok just some fancy-looking Koopa. They must be the big guns before Bowser." Then proceeds to kick the koopaling's tails. It isn't until much later that he realizes he's been fighting literal children the oldest being 8 the first time they meet and that's only because Luigi himself tells him.