I don't think that any NWN prestige classes transform you into an outsider (though RDD and Palemaster do change your race).
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I noticed the Outsider Shape feat... What's up with that?
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Outsider Shape is a shapeshifting ability. Once you use this feat you can shift into an Azer Chieften, Rakshasa or Death Slaad. It will change your race to outsider, but you will be unable to manipulate your inventory whilst shifted.
Ousiders are basically creatures not from the current plane of existance. I might be wrong but if you were to goto say the ethereal plane, you will become an outsider and Banishment etc. will affect you.