Board Thread:Suggestions forum/@comment-31382381-20170225024029/@comment-27200931-20170226153957

What if there are small communities of pure Black Númenoréans inside Mordor? It was never stated from where the Mouth of Sauron came, and in the book he rides from the Black Gate accompanied by a "black-harnessed soldiery" to meet Gandalf and the others. We all know the racial advantages of the Númenoréans, and it makes sense that Sauron would create these communities inside his realm to "breed" skilled and badass commanders and warriors.

There's also another character that could possibly be a Black Númenoréan, the Lieutenant of Minas Morgul, Gothmog. It was never stated in the book what he was, albeit in the movies he was depicted as an Orc.