Current Polynesia is totally ethnically diverse. Every race on Earth is represented in the total Pacific expanse. In the two or so years of Colonial occupation, Polynesia was less diverse. Some authorities speculate that white Aryans might have been a part of the mix, along with so-called yellow Chinese, and brown Southern Asians.
But in know prehistory, this racial mixture ended up in New Zealand. And it from there that Kermicha's people moved to Kermadec Island, and this totally fictional story begins. So, think of Kermicha's people as living in a time when only that reduced number of ethnic people, who ended up on New Zealand existed, and no people existed on any of the multitude of Pacific islands from Kermadec Island to Hawaii.
And furthermore, the language, the culture, the religion, and the mythology of Kermicha's people comes only from this author's mind. But, I do hope it enchanting enough to maintain your attention. If not, blame it on me, not on Kermicha.
