Bombadil
To me, Bombadil is one of the most fascinating characters in the book, and it always frustrates me when people dismiss him as an incongruity in LOTR.
Tom is Eldest and Master. I don't believe he is one of the
Valar. I think he is the power of the earth itself. He is Cronus to
Manwe's Zeus. He might be best compared to one of the precursors of the Olympian gods in Greco-Roman mythology, the titans.
Not original with me; some have made the obvious comparison of Bombadil to Melchizedek of
the Old Testament, an enigmatic character of great spiritual authority, who is "The King of Salem" (a reference with a double meaning---the king of the
city that was to become Jerusalem, but also, literally translated, the "king of peace") and perhaps the prefiguration of the Christ to come. Jesus makes it very clear that his preisthood is not the same as that of the Levutes, but that he is "A priest of the Order of Melchizedek".
Tom perhaps represents what Camus called "the tender indifference of the universe", an order above the ordered morality of
men. A leopard is good in that it hunts the deer, even though that seems cruel to us. He is clearly good, but also answers to a clearly different morality and order of things than the other characters in the book. He is above their struggle, though not entirely indifferent to it
He has somewhat of a smaller-scale analog in Merlin in the last book of Lewis's space trilogy, THAT HIDEOUS STRENGTH.
Don't know if that shed any light or not. More questions than answers. Let me know.