If I remember correctly, the Mouth of Sauron is basically a guy that interprets Sauron's will. Forgive me for being sacrilegious, but I think you could interpret him as a kind of prophet. He didn't really play that crucial a role, though, so I don't think any injury was done by leaving him out of the movies.
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I shall call him Squishy and he shall be mine and he shall be my Squishy.
-Dory, from Finding Nemo
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