We have a chance to delve into the books AND the cinematic universe with this question, so let the lore flow like water 😎
DISCLAIMER: No main/ specific characters allowed for this question, so brace yourselves 😉
We know that both sides in the War of the One Ring had numerous allies in the form of creatures, beasts, magical beings, etc. (remember, we are talking about general characters or groups, not main/ named/ specific characters ✊🏻). You know, the ones who were just game changing for each side.
Which brings us to our discussion:
1) Who were the most valuable players for the forces of evil? Why so?
2) Who were the most valuable players for the forces of good? Why so?
Even in the War of the One Ring, each side certainly had their Most Valuable Players 😉