The thieves use their favourite sweets to drain the Kirakiraru which differs from member to member - Gummy desires the Kirakiraru from cakes, while Pulupulu seeks the Kirakiraru from puddings. If they swallow the Kirakiraru, they can transform into bigger and more powerful forms of themselves depending on how much they use. In episode 11, the thieves were all purified by the Cures, with the star-shaped buckles shattered. In episode 12, Gummy reveals to the Cures that he and the other fairies who once comprised the group were given the belts by Giulio, putting them under his control.