Speculah:Make a Wish

Kyuubey's proposition includes granting a wish in exchange for the person to become a mahou shoujo. This page lists those who have encountered Kyuubey and guesses about wishes. Note that these are speculations and not the character's actual wishes.

Madoka's Wish

Deus Ex Machina or "I wish Mami were alive"

Madoka wishes Mami back to life. This one is so easily corrupted, especially if the "Witches are fallen magical girls" theory proves true. You wished her alive Madoka, you never said as a magical girl!

Homura's Wish

Do you really want her dream to come true?

Homura might have used her wish to help someone else (Madoka?) and is the person Mami was referring to when asking Sayaka whether she wanted to make someone's dream come true, or be thanked for making it come true.

If you do, you'll lose everything

Homura might have wished to become the perfect girl and undo her previously unhappy life. She was a classmate and friend of Madoka, which is why she knows her way around the school. However, everyone's memories of Homura vanished because she wanted her old flawed, bullied, unpopular self to be forgotten.

Mami's Wish

"I don't want to die alone!"

Before she met Madoka and friends, Mami was all alone-- her apartment was empty except for her presence, and had no contact with her family. When Kyuubey made his offer, Mami wished to not die alone. As in many "deal with the devil" stories, the contract is upheld, yet in a twisted manner: Mami made new friends and immediately died before their eyes.

Sayaka's Wish

Kamijou

Sayaka will make a wish for Kamijou's health, but when he leaves the hospital he will be killed in an accident.