"Oh look, Mario and gang!" -Princess Ivy. Princess Ivy is one of the main characters in Super Mario: The Three Princesses. -Spoiler Alert- Princess Ivy is the one responsible of the kidnapping of Rosalina. Mario and the others found out that by catching the 18th Luma who knew everything about it. She was found at the Star Castle in Level 10.
She appears as a cameo on Mariokart 11, A main character in Super Mario: The Three Princesses, and what seems like a hidden easter egg in Kid Icarus: The Pearl Necklace.