I just love it when people don't understand the quote their replying to in the slightest.
Mother doesn't need Ninten, it doesn't need Porky, it doesn't need 3 characters.
My point:
- Adding a Villian (not a reason to have 3 Mother characters)
- Said character is unique (not a reason to have 3 Mother characters)
- having a character not as highly requested as many others (not a reason to have 3 Mother characters)
- Representing the last remaining Mother game (probably IS a reason to have 3 Mother characters. Yet possibly still not because Mother 1 is so similar to Mother 2.)
So there is no reason to have 3 Mother characters except possibly that last one. It's the most and probably only justifiable reason for 3 Mother characters to be playable in the game.