My favorite way to play BG1 is with the canon party:

Imoen
Khalid
Jaheira
Dynaheir
Minsc

And then with a fighter - berserker main character. Berserkers are extremely strong, becoming outright immune to some of the most annoying spell effects enemies can throw your way. I also like to headcanon that the berserker bloodlust is actually a manifestation of being a Bhaalspawn and is what allows my character to control the Slayer form in BG2.

So there is my 2 cents.