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There are four guardians so, probably inspired from the 4 tikis as Silktree said. Another interesting point is that in alchemy, there are four elemental symbols.
This is true; however, it almost feels like low-hanging fruit to me because the four elements are such a common concept across many cultures.
Air = Rowlet?
Fire = Litten
Water = Popplio
Earth = Iwanko?
There's also the mention that the four share a secret....
Although there may be something to this...