Princess Kiwi in Dimension D.

Princess Kiwi is the 4D counterpart of Princess Peach. Dowser, The Roopa King, has tried to take over by kidnapping her, but lost to Quario and Fourigi. After Dimentio made Dowser a minion, Dowser locked Kiwi in Dimension D. After Mario unlocked 4D Tower, he found a note Princess Kiwi left proving she was trapped in Dimension D. Quario then later found the same note. She was later rescued along with everybody else during the assualt on the Dimensional Gateway, and Dimension D was destroyed shortly therefore, she later appeared to help Mario find the Crown Dimension's secret.