The one in the OP? If so, I have countless reasons to believe he is ILE, including huge number of guesses I made about him which he confirmed - including tricky questions & stuff that I used to avoid him trying to give me "the right answer" (sometimes he had to answer negatively or differently than hinted), IIRC. And virtually no doubt. I don't know, everything about him is ILE, except perhaps annoying me for no apparent reasons, lacking (IMO) constructive goals, which I don't find very ILE-ish
. He pretty much introduced me to areas in philosophy and astrophysics, and unlike perhaps all Deltas I know, he has genuine interest in science and philosophy - the way I see this, he lacks those social or interest-related purposes when it comes to it. He is so much interested in knowledge for the sake of it that he kinda neglects his social life or career pursuits. We talked a lot, he understands Socionics quite well nowdays, IMO.
His father is IEI and he told me that they argue a lot - his father argues about everything as a sport- FTR, his father VIs like some Beta NF "old fox" style, like David Carradine or Iggy Pop.
I think he is pretty funny, but I never met him so far.
His LSE brother, although younger, was very controlling and was ordering him what to do - you know, the proper thing to do, listen to the parents, what to spend his money on, etc. I met other Alpha/Beta Irrationals who had such character in their family and who were similarily avoidant and passive-aggressive (including my Fe-Creative ex). I think this might be an explanation.