These are placed in 3 groups. Those supporting Good, those supporting Evil & 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 & of Rivendell; Gondor & 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 & the Giant Spiders; Smaug; Variags of Khand

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