These are characters who appeared very briefly or are only mentioned.
“Princess Eclair is the princess of the Waffle Kingdom, and the lover of the Chestnut King. Luigi...Princess Eclair
“King Mousta was the king of Dry Dry Kingdom. He is only mentioned in the game Paper Mario by a...King Mousta
“The Mushroom King was Princess Peach's father and king of the Mushroom Kingdom. Never appearing...Mushroom King