For Astarion it was Bard 8/Rogue 4 with hand crossbows, for high AC and quite a damage. For my main I liked Sorcerer 8/Warlock 4 the most. The strongest char I had with me ever was probably Gale with Abjuration Wizard 12. That was in a modded playthrough with much higher difficulty than Honour mode where I needed any defence I could get.
