A pairing that struck me from the first time I read the Silmarillion (and UT) is, perhaps not too surprisingly,
Turin and Tuor. Very similar in backgrounds but, even exclusive of the debatable (in various threads) effect of Morgoth's curse, one was suffused with a surfeit of pride and touchiness while the other, despite an arguably even more troubled early years, did not get too full of himself. Of course, Turin was more "extreme" in many ways, including the strong affection and committment to him he evoked in men and elves, and as a warrior.