And speaking of Arien, what about Tilion? And another first age character that is often forgotten is Aerin.
Ugluk is my favoutire orc, and he definitely is not that "minor". Gorbag is definitely "the one and only metaphysical philosopher of the Orcs", and that's saying something!
And Gothmog is often forgotten as well - not the first age balrog, the 3rd age "vice captain".