Great Butterfly Fairy

Quote from The Legend of Zelda: The Minish Cap Great Butterfly Fairy figurine:

"The Great Butterfly Fairy of Minish Woods. She provides you with a larger wallet, allowing you to carry more Rupees with you."

The Great Butterfly Fairy will provide you with a large wallet, but first she asks if you will give all of your rupees to her. If you accept, she won't take your rupees, and give you a larger wallet instead.