Well... let's see here are your pure-class men and women (kits included)
Haer'Dalis- your tiefling, he is a good SUPPORTING cast, Blade (bard)
Imoen- Thief dual to Mage
Nalia- same, but with yuck thieving skills
Korgan- Beserker (fighter), will have conflicts with Aerie, Chaotic Evil, but will always have a large reverence for what the character will have to say.
Viconia- Cleric. Neutral Evil... quite a nice lass if you like her..
Edwin- Conjurer (mage), the biggest bad ass mage in the game, a must have, Lawful Evil
Keldorn- Inquisitor (paladin)
Anomen- Cleric dualled to Fighter
Minsc- Ranger
You can have a party with all pure classed men and women if you don't consider dualling as a form of multi-classing, but then the best at what they do are thee evil ones sad to say... so don't worry about it! Experiment, have fun! See what the have to offer, the key thing in BG2
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Chaotic Cavalier of ALSB, protector of the Innocent, slayer of the mad...