The one comparing him to Eärnur in the Appendices is pretty key, I think, for one type of storyline.
Likewise, his way of responding whenever things go in directions he doesn't personally think are a good idea: he tends to make clear his disapproval, but bow to the will of the group or the leader of the group (if this is not him).
I, of course, find his interactions with Strider in the Council of Elrond fascinating, but you know me - An Aragorn Fan of Sad Proportions, so really, is there anything having to do with Aragorn that I don't find fascinating? But it does set up an interesting dynamic of doubt, submission to perceived authority, to tradition, and then you add Faramir's claim in TTT that if Boromir were satisfied of Aragorn's claim, then "Boromir would greatly reverence him" (or something to that effect), and I think you get an interesting picture of Boromir's understanding of power, its origins, and the position he gives his own judgment when he's outside of Gondor.
It's also interesting that although Denethor is clearly attached to Boromir, we don't really get any information about how Boromir feels about his father. I can't think of a quote in which he says something about Denethor beyond naming his position. So that really is a kind of blank in his psychology and character - it all has to be inferred.
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Likewise, his way of responding whenever things go in directions he doesn't personally think are a good idea: he tends to make clear his disapproval, but bow to the will of the group or the leader of the group (if this is not him).
I, of course, find his interactions with Strider in the Council of Elrond fascinating, but you know me - An Aragorn Fan of Sad Proportions, so really, is there anything having to do with Aragorn that I don't find fascinating? But it does set up an interesting dynamic of doubt, submission to perceived authority, to tradition, and then you add Faramir's claim in TTT that if Boromir were satisfied of Aragorn's claim, then "Boromir would greatly reverence him" (or something to that effect), and I think you get an interesting picture of Boromir's understanding of power, its origins, and the position he gives his own judgment when he's outside of Gondor.
It's also interesting that although Denethor is clearly attached to Boromir, we don't really get any information about how Boromir feels about his father. I can't think of a quote in which he says something about Denethor beyond naming his position. So that really is a kind of blank in his psychology and character - it all has to be inferred.