The Fellowship of the Meme Open Role List Mark II.
I have added classifications for lesser-known (primarily book-based) characters.
The Company of Thorin Oakenshield:
Ori
Nori
Bifur
Oin
Gloin
The Elves:
Celeborn (Lord of Lothlorien)
Gildor Inglorion (Elf that Frodo met while moving to Buckland, book)
Rumil (Guard of Lothlorien, book)
Cirdan (Former Ring-Bearer, guardian of the Grey Havens, book)
The Men:
Isildur
Elfwine (Son of Eomer)
Elboron (Son of Faramir and Eowyn)
The Master of Laketown
Bill Ferny (lives in Bree, book)
Theoden
Theodred
Denethor
Beregond son of Barahir (lives in Minas Tirith, book)
Bergil (Son of Beregond, lives in Minas Tirith, book)
Anarion (Brother of Isildur, ancestor of Boromir and Faramir, book)
Barliman Butterbur (owner of the Prancing Pony, book, unnamed in film)
The Dwarves:
Dain Ironfoot
Thorin III Stonehelm (Son of Dain, appendices)
Thrain
Thror
Fundin (Father of Balin and Dwalin, appendices)
The Hobbits:
Belladonna Took (Bilbo's mother)
Bungo Baggins (Bilbo's father)
Lobelia Sackville-Baggins (Thief of Spoons, book, cameo in film)
Otho Sackville-Baggins (Husband of Lobelia, book)
Lotho Sackville-Baggins (Son of Lobelia and Otho, book)
Fredegar “Fatty” Bolger (Friend of Frodo, Sam, Merry and Pippin, book)
Hamfast “The Gaffer” Gamgee (Father of Sam, book)
Farmer Cotton (Father of Rosie Cotton, book)
Ted Sandyman (book)
The Evil Ones:
Azog
Bolg
Gorbag (Orc, book)
The Great Goblin
Grishnakh (Orc, book)
Shagrat (Orc, book)
Snaga (Orc)
Ugluk (Orc, book)
Khamul (Ringwraith, book)
The Balrog
Smaug
Melkor / Morgoth
The Wizards:
Saruman the White
Radagast the Brown
Alatar the Blue (appendices)
Pallando the Blue (appendices)
The Miscellaneous:
Tom Bombadil (book)
Goldberry (wife of Tom Bombadil, book)
Gollum/Smeagol
Landroval (Eagle)
Gwaihir (Eagle)
Quickbeam (Ent)
This is not an exhaustive list. Seriously, there are Too Many Characters to list.
OCs are welcome if you do not feel like filling these roles! Please contact us before creating one though.