Philosophical themes of The Lord of the Rings- our world reflected by Middle-Earth Yeah, I've always thought of Sam as the main hero. 'The Choices of Master Samwise' is the most pivotal and interesting of the chapters for me. The other characters all have a tough job, but they can confer with each other about the right thing to do, and the right thing to do is usually rather obvious (except for the fact that no one thought to enlist Gwaihir to drop Frodo off at Mount Doom). Sam's stuck on his own in a really shitty spot. I was never wholly convinced of his decision to abandon the quest and follow Frodo's dead (as he thought) body, even though it turned out to be the right thing to do for the quest. It was irrational based on the information he had at the time. Maybe that's the idea - his instincts saw past the rational analysis or something.
Aragorn is a sort of hero, but he doesn't have a whole lot of difficult choices. He just has to do what a king has to do, which he does. To make Aragorn into a more interesting character, you'd have to make him fail at that, and then redeem himself, or not. Boromir is more interesting in that way.
The Akallabeth has to be the best analogy for the rise and fall of earthly civilisations, but that's not in LOTR.
Regarding allegory, Tolkien contrasted it with applicability, and said he preferred the latter. I presume his own application of his work is to Christian myth, but I'm sure he would have been relaxed about others making other applications.
Also there is an analogy with academia. Denethor, Gandalf, Elrond (Roland, I'm only trying to help you Roland), Saruman, are University dons. Frodo's a PhD student. Merry and Pippin are undergraduates. Boromir is head of the Rugby team.