(1) Imoen - you are forced to take her initially
(2) Xan - you meet him in the mines and he is investigating the cause of the crisis
(3+4) Khalid and Jaheira - told to recruit them, Harper's investigating
(5) Yeslick - In the cloak wood mines, run right into him, a real reason to take down the iron throne
2 multi class fighter/healers
Party hits all of the needed requirements, charname can be anything. All characters have a strong story driven reason to be there. If you follow the main quest and nothing else you find them all. Honestly, it makes much more sense than bringing Minsc and Dy along.
Please tell me how I'm wrong