Oct 10 2012, 3:13pm
Haven't read the "Silm" or any of the appendices in ages, so I can only really think of characters that are featured prominently in LOTR/Hobbit.
However, I feel one of the great things about Tolkien's works is that real "power" had little to do with physical strength.
That said, in a battle, a few very powerful beings might be:
Good: Elrond, Glorfindel, Galadriel, Bombadil, Gandalf, Eagles
Honorable mention: Beorn, Aragorn
Evil: Sauron, Balrog, Witch King, Ungoliant, Shelob, Saruman (before he lost his power, obviously), Watcher in the water, Smaug
Maybe the Mountain Giants mentioned in the Hobbit, not sure if those should be under good or evil
In the movies Elrond, Denethor, Haldir, Galadriel, and Celeborn stink.