This is the second model from the Elegy of Emptiness series. In Majora's Mask by playing the song, Elegy of Emptiness inside Stone Tower, Link can 'shed a shell' of himself to create a statue of his current form. Described as a souless image, these are used to solve a variety of puzzles later on. The image created depends on what form Link is in at the time. Wearing the Deku mask the statue produced is a small sad looking Scrub.
Since the Zora and Goron statues appear as Mikau and Darmani (the souls which reside in those masks), it is believed that the Deku mask was derived from the Deku Butler's missing son. This is hinted at during serveral scenes in the game.
Oddly enough, the Deku statue is too light to press floor switches down, so has no real use in the game.
~15.4cm tall without the stand, which adds another ~7mm, though the height will strongly be influenced by how straight the leaves are. It's very top heavy so weighing it down inside the little legs is required else he'll tip over backwards. Fairly large pieces, so nothing too complicated. You must cut the eyes and leaf shapes out yourself.
As usual thick paper or thin card should be used, plus the PDO file with Pepakura Designer or Viewer (see links section).