Uura Tribe

The Uura Tribe was supposed to be a mysterious race found in The Legend of Zelda: Mystical Seed of Courage. Not much is known about these people, other than a few single lines from the developers that mention that they were planned to be key characters in Link's quest. They were intended to be located in a dimension other than Hyrule, which Link could travel to and from.

Theory
It is likely that Uura Tribe was a draft of the Subrosians. This is supported by several facts:
 * Several elements from thier game were moved to Oracle of Seasons and Oracle of Ages after the cancellation of Mystical Seed of Courage, and the tribe could have very likely been one of them.
 * It is said that they were intended to be smiths, and the Subrosians seem to be highly skilled in that particular expertise.
 * The translated name for "Subrosian" is Ūra, which is similar to "Uura".

It is also rumored that the idea of these people may have been moved to the game Freshly-Picked Tingle's Rosy Rupeeland, and renamed as the Yamatami Tribe.