Princess Boo, also known as "Booette" and "Boosette" refers to Rule 63 Super Crown fan art of the Nintendo character King Boo as a princess. Alongside Bowsette, the character saw a surge of fan art amidst a wave of Nintendo characters being drawn as women after the introduction of the Super Crown mechanic into Nintendo lore.
Booette is a young woman with pale skin, white hair and pink eyes. She wears a white layered ballgown with puffy sleeves and ruffle lining around the top, layers and sleeves. She wears a white ruffle necklace with a red gem and white gloves with the same ruffle lining. She wears a super crown, a powerup item in the Super Mario games. She has noticeably sharp teeth and a pointy tongue.