Super Crown (Item)

The Super Crown was an item introduced when Toadette was brought into the main game series. Toadette would become Peachette when she put it on.

This lead to a lot of fan art of Bowser putting on the Super Crown to become a Bowser version of Princess Peach called Bowsette.

This lead to a deluge of gender swapped and feminine versions of classic Mario characters. As well as non-Mario characters.