Bombadil, who knows what he is exactly, he seems to predate the Maiar! If we believe him anyway.
What he undoubtedly is, is Tolkien's self-insert character, if not in terms of personality, in terms of political views - this is very well-illustrated in Tolkien's letters, where he espouses utopian anarchism of a rather Unabomber-ish kind (largely minus violence, though he does support people "dynamiting factories" - a quote). His views seems to that the ideal is utopian anarchy where we live in the forest with our hot spouses, or failing that, rural quasi-anarchy as per the hobbits (who are very capable of self-organising as needed but seem to lack permanent leaders for the most part), and failing that, a distant third place is having a "good monarch" like Aragorn - but in one letter he does refer to Aragorn as "Sauron in miniature" or something very close to that, so he's clearly a little uncomfortable with him.
And yeah Melian I don't think caused any wrecking (her kids is another story entirely).
