SimNatives are Sims who are native to a few of SimNation's areas. They are mentioned in The Sims Vacation, which might mean that they inhabited Vacation Island before all of those resorts, camps, lodges and other recreational facilities were built. They may have inhabited Wanmami Island in The Sims: Castaway Stories.
Their physical, in-game appearance is unknown, although they might have looked like some residents of Twikkii Island.
It is also implied that they are responsible for Admiral Landgraab's early demise almost sixty years before The Sims 3.