Thx for the update.
What will be native resolution for the game? I mean if it works like baldurs gate, planescape, icewind dale and other IE games there is a native resolution like 640x480 or 800x600 giving it higher resolution will result in smaller objects. Im glad chose IE, 2d environment looks much, much more detailed. IE games with resolution patches still look great, 10 years+ after release.
In old d&d games i always chose mage as my main character. It was the most intresting class for me because, well, because you had so many spells and so many options with them in combat, massive croud control and aoe spells and simply single target spells that did a huge amount of damage and that all was in one class, leaving all fighter classes, with only gearing up option. Its really hard to get a good balance with so many classes, but if you will have druid and bard (chanter) make them worth taking them into the party. For example druids transformation in bg2 was totally pointless, (was bear, brown bear and wolf if i remember correct), what you can make is something like snake(for example) transform with poisoning damage so we could use it against specific creatures that are weak to poison damage, that will make such characters valuable for party (atleast in early stages) and atleast they will not be totally pointless.
Anyways, that is just an example of what can make us use different classes. And of course you can always get + 5 people in group, thats why i love d&d because other characters do matter, you play all 6 characters not only mage ot fighter or rogue or healer.