Leila is a character that appears within The Minish Cap. She is a young girl that attends Funday School. Link is first able to meet Leila after completing the Temple of Droplets, in which Link can then enter Funday School.
Link is able to fuse Green Kinstones at various points in the game with Leila. As it is a Green Kinstone fusion, it is not set to a specific treasure chest, but instead, one of the many possible treasure chests. There is one random Red Kinstone within the game that opens up a location in the Hyrule Castle Garden leading to a Piece of Heart, as well as a random Blue Kinstone that opens up a tree in North Hyrule Field leading to a Fairy Fountain. Leila is one of the many characters in which Link can make these Kinstone fusions with.