Uh, there's no NPC interaction in BG1, at least in comparison to BG2. They'll have little voiced interactions that don't stop the game. One character telling the other that they shouldn't be so evil, etc. Having also played BG2 first, it makes the game seem bare And there are plenty NPCs from the first game that never made it into the second one in a playable capacity, unfortunately. You accidentally murder Ajantis in the Windspear Hills, and Xan/Montaron are obviously killed by the Harpers. Quayle becomes Aerie's adopted father ("uncle", whatever) and settles down, Tiax is imprisoned in Spellhold, one of the bards (never used him) is killed by a werewolf in one of the forest maps around Suldanesslar, another of the bards I believe is mentioned by somebody to have written a song about you. Dynaheir and Khalid are murdered by Irenicus. Viconia and Edwin are still playable, as are Jaheira and Minsc, obviously. I guess the "canon" BG1 party consisted of the PC, Imoen, Minsc, Dynaheir, Jaheira and Khalid. Pretty similar to what I used, actually, except I replaced Khalid right off the bat.
There are probably a few I'm missing
I've been trying to install the banter mod for BG1tutu, but it's not working
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I remember Jaheira died very early to an Ogre in BG for my game. I mean she really died too, like bits and pieces all over the place. Khalid was a bit broken up, but he was actually a lot more tolerable after a bit. I think he does better without that bossy bitch in his life.
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Poor Jaheira, has no love here.
None from me either.