Sorry but I'm not in the mood of discussing movesets and concepts right now."I don't like bandana dee" is not the point, that's where other people dragged the discussion to, I was talking about different things.
You clearly did not understand a word of what I said. Metaknight and Dedede are special because they require a special method for unlocking them and it is that you have to throw an heart at them after defeating them in their bossfight; no other character is unlocked this way. Three Mage Sisters are unlocked by getting a best ending, you have reach a specific goal in order to unlock them (collect a certain amount of hearts in the another dimension mode), all the other characters are unlocked automatically each chapter of the story, Bandana Dee is unlocked by the start, so first chapter; their order is based on their creation date, not importance.