6 - no opinion on Viconia's looks. Frankly, I'd leave BG1/2 characters only as quest givers, maaaaybe accompanying the party in a quest or two (like Halsin in the Shattered Sanctum, or Drizzt against the littly freaks in BG1). BTW - stupid pieces in her hair aside (I hate the hair beads fetish of BG2), I love her grannylike apearance - she old half-elf!;
You're confusing Viconia and Jaheira, Viconia is a drow.
I think it was dependent on the charisma of the character in the party leader slot, whether the party conflicts would happen.
No. Those were scripted interactions between the certain companions that were triggering at random (but unavoidably, unless save scumming). They were no more dependent on the leader's charisma than early conflict of SH and Lae'zel in BG3.
