Person? - Yes.
Mortal? - No.
...from the Third Age? - No.
Halfelven? - No.
Is it an Ent? - No.
Was that person evil? - Unambiguously yes!
Mouth of Sauron? - Nah. He was a) a Black Numenorean, i.e. a Man, and thus mortal, even if artificially long-lived; and b) from the Third Age.
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Und aus dem Erebos kamen viele seelen herauf der abgeschiedenen toten.- Homer, Odyssey, Canto XI
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