Balrogs (winged and non)
Barrow-wights
Crebain
Dragons
Dwarves

Elves (High and Wood)
Ents
Fell Beasts
Giant eagles
Giants
Giants spiders (those in Murkwood and Shelob)
Goldberry
Gollum
Half-elves (Elrond, Aragorn)

Half-orcs (the southerner in Bree)
Hobbits
Huorns
Kine of Araw
Maiar (Gandalf, Sauron, Saruman)
Neekerbreekers
Old Man Willow
Oliphants
Orcs (goblins)

Petty-dwarves
Ring-wraiths
Tom Bombadil
Tricksy lights
Trolls
Uruk Hai
Wargs
Watcher in the Water
Werebear (Beorn)

-m