The Goodwill Ambassador
The Goodwill Ambassador is a character found in the Game Boy Advance game Mario & Luigi: Superstar Saga, released in 2003. The ambassador, who is actually the witch Cackletta disguised as Lady Lima, only appears in the opening cut-scene of the game where she and her accomplice (the evil mastermind Fawful) pay a "good faith" visit to the Mushroom Kingdom. Their intentions are to steal Princess Peach's voice in order to awaken the Beanstar, a magical and mystical object which is said to grant wishes and fulfill anyone's greatest desires. In order to stop people using this power for evil, the Beanstar was cast into a deep sleep that could only be awoken by the voice of a pure and noble soul. The only person currently known to possess such a voice is Princess Peach, ruler of the Mushroom Kingdom.
The evil Cackletta and Fawful, of course, have no greater desire than to rule the world, so they take the disguise of goodwill ambassadors of the Beanbean Kingdom who come in the name of their monarch, Queen Bean. They notify the Mushroom Kingdom in advance. To welcome them, the kingdom organizes a ceremony in the honor of their arrival. Upon entering the castle, the ambassador and her accomplice formally present themselves to Princess Peach. Explaining that she wishes to improve her kingdom's ties with the Mushroom Kingdom, she brings a gift from Queen Bean. Fawful then presents a box to Princess Peach, who shows her curiosity for the gift and steps forward in interest. The box's lid unexpectedly flips open to reveal a jack-in-the-box, which disperses a green gas that surrounds Peach's head, extracting her voice. The Toads nearby start panicking, unable to do anything to stop them. Casting their disguises aside, the villains make their escape through the roof of the castle. They then fly back towards the Beanbean Kingdom to steal the Beanstar from Beanbean Castle.
Cackletta and Fawful do not take the disguise of the ambassadors a second time in the game. However, it is revealed later on in the plot that Prince Peasley of the Beanbean Kingdom knew that Cackletta was after the royal voice, so he beat them to the castle and warned the princess. Peach's tells her most trusted subject, Toadsworth, and together they organize an an imposter to take her place for when the ambassadors arrive. They steal the imposter's voice instead while Peach and Toadsworth hide behind a curtain. The voice is not found to be a fake until it drives the Beanstar mad, instead of awakening it as planned.