So I've played BG1 several times (vanilla a long time ago, EE over the last couple of years), did 1 SoD playthrough, 1 IWD EE playthrough and am currently doing my 2nd BG2 playthrough.
There are still some kits or classes I haven't played around with but I've tested and know a bit about most of the ones that I was most curious about.
For example, in my current playthrough, I have a Darkmoon Monk (charname), Archer, Shaman, Wizard Slayer, Fighter/Thief, Inquisitor (Keldorn). I have no arcane caster which makes some things a bit weaker at times (no haste/improved haste, mass improved invis, breach, etc.). I'm still liking this party so far overall. The shaman is my only healer/support. I try to go lighter on buffs and magic this time around, use Keldorn's Dispell Magic a lot more and have a lot of physical damage. The synergy and idea is to dispell stuff, have the Wizard Slayer and Insect Swarms from the shaman neutralize enemy casters and win with brute force.
I love AOE damage spells but aside from late game Abi Dalzim in BG2 (not party friendly in IWD) or maybe some of the HLAs, I can't remember too well, I often was very limited using those (Skull Traps, fireballs, lightning, clouds, etc.) because I often had at least 2-3 melee based characters. This led to my Sorcerer or Mage often ending up mostly buffing the party, debuffing enemies and dispelling enemy defenses with occasional damage output which I wasn't too happy about. Have some of you come up with interesting party compositions where you can often blow up enemies with AOEs? I was thinking maybe only 1 front line and some other ranged classes like Archers?
What are some of your favorite party setups or even just 1-2 classes that synergize well together that aren't a typical "balanced" party (tank/healer/mage/thief)? For example, Shaman (or Druid)'s fireseed having some high synergy potential with Wizard Slayer as the AOE seed can apply his debuff.
What about solo? I know most people prise the Kensai/Mage or Sorcerer. Do you have to avoid several situations or enemies when soloing (depite leveling faster, there are many situations in BG2 that even with a full party, I'm sometimes missing some key abilities that would help a lot or be needed, sorcerers grow in power but might struggle vs magic immunities or only have sword summons for physical damage).