Open door build advice for BG1?
I found BG1 to be much harder than BG2. Traps are more frequent and deadly, characters have fewer hit points, and characters miss a lot more often. I only beat BG1 once.
I have solo-beaten BG2 with every character class, but not TOB. The easiest BG2+TOB party I ever played had no full casters; it was all fighters and rangers and paladins. Very few enemies survive being hit 50 times in one round. The NPC Paladin has the ability to cast True Sight and a high-level Dispel, and there's a weapon he can pick up that makes it even better.
For Baldur's Gate I, you may want to pick your class based on what companions you want. There are many rogues, several wizards, some fighters, a few clerics, and one druid.
I don't know about magic weapon availability, but if I had to pick one character to run through the whole thing with:
Non-caster: Fighter, with a high strength, dexterity, and constitution. Switch-hit between ranged weapons in BG1 and Two Handed Swords in BG2. You should have enough ability points to Grand Mastery bows in BG1, then do the same in BG2. You want bows in BG1 because it gets you 1 to 3 rounds of free attacks against many enemies, and you want fighter because you level up faster than paladin or ranger and can attain Grand Mastery for more attacks per round. Also, ranger and paladin have more secondary attributes that make it harder to max str/dex/con. If you have to pick one stat to not max, pick Str. There are more +STR items than anything else in the game.
Caster: I'd either go straight wizard (don't pick the subclass that blocks evocation),
or I'd do ranger dual-classing into cleric. It's a long haul dual-class because you want Ranger 9 (+1/2 APR, max hit points), so you don't do the dual class until BG2. This gives you an archer all the way through BG1, with some minor healing abilities. A ranger dual-classed into cleric gets access to the entire druid spell list as well as the cleric list. Insect Plague or Creeping Doom are the best anti-caster spells in the game, and druids also get Ironskin, which is basically Stoneskin, giving you immunity to CL/2 weapon attacks (bypassed by elemental damage). You end up limited to bludgeoning weapons, but some of the best weapons are bludgeoning. Despite being a full caster, I think this character ended up being a gish, casting "BUGS BUGS EVERYWHERE" before charging in and dual wielding a certain hammer and flail combo for a lot of damage.
Roger said:
Don't play a dedicated evil play through, it's poorly implemented and just makes your life harder.
For BG1 perhaps. For BG2, the individually strongest party members are evil. Evil is a quick and convenient path to power, and you don't have to fight nearly as many level-draining enemies. If you go evil in BG2, be sure to get Edwin the Nether Scroll.