These are placed in 3 groups. Those supporting Good, those supporting Evil and those that could be turned to either side.

The Forces of Good...Army of the Dead; Dol Amroth, ally of Gondor; Eagles; the Elves of Lindon, Lothlorien, Mirkwood and of Rivendell; Gondor and its allied states; Hobbits; Gandalf the Grey, then White; Radagast & Rohan

The Forces of Evil...Azog the Defiler, spawn of Sauron; Balrog; Barrow Wights; Bats; Dead Marshes; Haradrim; Sauron the dark Lord; Shelob and the Giant Spiders; Smaug; Variags of Khand

The Undecided and Ugly!...Lake (Dale) Town; Corsairs of Umbar; Dunlending Tribes; Dwarves Tribes, the Longbeards, Firebeards and Broadbeams, the Ironfists, Stiffbeards, Blacklocks and Stonefoots; Easterlings, those settled near Lake Rhun and the Wainriders; Ents & Huorns; Saruman the White, then Multicoloured