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Elves came from the faewild and they primarily differentiate themselves by their closeness to that original source. Standard Tolkien High Elves with their pale skin, and fair hair are the closest. Wild elves are elves that have bound themselves more closely to the material plane and are more adapted to where they live and kind of come in their own categories (though the elves see these differences as less important) Wood elves are shorter, tend to darker hair, though still pale. Sea elves are the shortest with almost unsettling long hands and feet with the beginnings of webbing and eyes adapted to water as well as air. Sun elves are tan skinned and dark hair similar to real world Italian or even Latino heritages while keeping the traditional elven physical build.
Dark Elves (“cavern elves” in 2e terms… but come on) come from the shadowfell and have a division similar to the High/wild variation of surface dwelling elves. But in their case the vast majority would be considered wild elves (native in their terminology). All dark elf children born on the prime material plane are born as native elves. It is said that dark elves from the prime material can consecrate themselves again to the shadowfel but little is known about it even among the dark elves themselves.

Leshies have a reincarnation process where at death they produce a seed that can then be regrown. The cycle from awakening to death and replanting is called a seedlife. Unless something prevents it the cycle appears to be unending best any druid or leshy can tell. Leshy seeds are extremely tough and while fire is the biggest risk it takes considerable time to cause enough damage to permanently kill one. This reincarnation has very poor recollection over the years, though memories of friends from before that continue in the next seedlife can stick and established gardens of leshies can have memories of each other that go back incredible distances in time. It is not guaranteed that the form of a leshy is the same from one seedlife to another.