Hey Alzrius,
Well heck yeah! What are the levels for the Fellowship? For Saruman? For the Nazghul? For Sauron (if available)?
All of the following levels and hit dice are reported in 1st Ed. AD&D terms.
The Fellowship of the Ring
Frodo - Level 8 Sout/Rogue
Samwise - Level 6 Scout/Thief
Legolas - Level 19 Fighter
Gimli - Level 5 Fighter
Aragorn - Level 18 Ranger
Boromir - Level 13 Fighter
Merry - Level 5 Fighter
Pippin - Level 5 Fighter
Gandalf the Grey - Level 27 Wizard
The Nazgul
The Witch-king - Level 40 Wizard
Khamul - Level 33 Ranger
Dwar - Level 26 Mage*
Indur - Level 25 Mage*
Akhorahil - Level 24 Sorceror*
Hoarmurath - Level 22 Animist*
Adunaphel - Level 21 Bard*
Ren - Level 21 Illusionist*
Uvatha - Level 21 Fighter*
* Tothe best of my knowledge Tolkien only named the Witch-king and Khamul and I believe the other names are ascribed by the writers at Iron Crown Enterprises
The Forces of Darkness
Melkor/Morgoth - Level 333 Mage/Alchemist
Ungoliant - 300 Hit Dice (333 after draining the Wells of Varda)
Sauron - Level 80 Mage/Sorceror (in hiding w/o The One Ring)
Sauron - Level 120 Mage/Sorceror (as Necromancer of Mirkwood)
Sauron - Level 160 Mage/Sorceror (before the One Ring was made)
Sauron - Level 240 Mage Sorceror (with the One Ring)
The Balrog of Moria - 24 Hit Dice
The Balrog Gothmog - 67 Hit Dice
Saruman the Many Colored - Level 33 Mage/Alchemist
If there are others you are interested I probably have something on them.