White Yummy

When one of the beings known as the Greeed approaches a human and asks what the human desires. A coin slot called a Medal Insert Slot (メダル投入スロット), which is also used on the Ride Vendor, appears on the human, and after the Greeed inserts a mystical object called a Cell Medal (セルメダル) into the slot, a monster called a White Yummy (白ヤミー) is formed from the human. Being the incarnation of its' host desire, a White Yummy physically devours that person's object of desire and "digest them" into Cell Medals. Once consuming enough, a White Yummy transforms into a complete Yummy, modeled after the animal on the Cell Medal.