What NPCs simply cannot get along with each other?

More specifically, what I wanna know is this: What relationships are particularly bad? I heard that some interactions even lead up to bloodshed and NPCs leaving the party.

This is about all I know about the interactions:
1) Generally good NPCs don't get along with generally evil NPCs.
2) The three romancable female NPCs fight over the male PC.
3) Yoshimo seems to get along with everyone just fine.
4) Korgan basically doesn't get along with anyone not evil (save for Yoshimo).

What else is noteworthy?

<font color="lightblue">Edwin/Jaheira
Jaheira/Haer'Dalis
Keldorn/Viconia
Korgan/Aerie
</font>

Hmm.

SPOILERS
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Aerie and Korgan just DON't get on; a personality clash.
Keldorn and Viconia evetually clash over religious differences.
Viconia constantly winds up Valygar.
Edwin and Minsc hate each other's guts, predictably.
Anomen and Keldorn start seeing red if Anomen fails his test.
Haer'Dalis will duel YOU if you romance Aerie.

There are loads of other neat relationships - some good, some bad - but these are the most violent ones.

SPOILER
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Valygar ONLY attacks Viconia when she mocks his manhood when the courtesan asks Valygar out.

SPOILER
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Valygar ONLY attacks Viconia when she mocks his manhood when the courtesan asks Valygar out.

Korgan DOES get on with Jan though...

"Haer'Dalis will duel YOU if you romance Aerie." What does that mean??

Good to know about these personality clashes but do any of them lead to an NPC's death or to an NPC leaving the party?

If an NPC does end up leaving the party because of it, then are they gone for good?

Precisely what it says! If you romance Aerie while Haer'Dalis is also in the party, the fool Blade will fall for her as well, and eventualy challenge you to a duel for her love. I kid you not.

Alternativly you can just download the files that get rid off the infighting and have any group you want. Basically one with Edwin and Keldorn in.

Warby