Kortz

Kortz is a character from The Legend of Zelda: Skyward Sword. He is a Mogma living at Eldin Volcano.

Biography
Kortz is first encountered in the Skyview Temple when Link returns to gather Sacred Water for Faron. He is convinced that there is treasure deep within the temple. Kortz finds and buries a Small Key, but forgets where he hid it, leaving Link to search for it in order to proceed. Once Link reaches the end of the dungeon, Kortz realizes that there is no treasure in the Skyview Temple and leaves, disappointed.

Etymology
As many Mogmas seem to be named after minerals, it is possible that Kortz is derived from quartz.