Came up with a powerful combo for Xan. Given that Xan get's really powerful at the higher levels and his bread and butter is party friendly crowd control, I planned what would be the best party for him.
I ended up deciding on just a 2 man group with a Fighter/Thief.
Normally for Fighter/Thiefs I play Dwarf for the Con and Strength, but this time I'm going with Halfling for the skill points.
Arguably you could do a similar party with a Bounty Hunter or other thief, but I figure with a Fighter/Thief I've got someone at least kinda tanky for when that's needed.
Basically solo until getting Xan, then make use of his powers to pretty much disable and confuse all in your path. Both characters are sneeky and rely on misdirection, stealth and trickery to get the job done. With just two in the party he'll quickly level into his powerful spells.
I haven't gotten to BG yet, so I'm curios to see how some of the harder fights go.