| Claxon |
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No. Wildshape does not change his subtype to outsider nor does it cause him to gain the extraplanar subtype. He is simply a *insert whatever race* druid with a really good magical elemental costume.
Banishment only cares ifa creature has the extraplanar subtype, which any creature not on their native plane has. The bestiary is written assuming creatures are on the material plane. If you go to a non-native plane (such as humans on plane other than material) you gain the extraplanar subtype and would be subject to banishment.