Honestly, just to troll Larian I'd go full lawful good on Astarion, uber goody-two-shoe. 0 tadpole, saving all the peasants and what not. Basically, everything he disapproves of as a companion.
And if Larian let's us edit their classes... well... vampire paladin here we goooooo.
Well, obviously I'd rather Larian focus on the story of our custom characters and ditch the idea of 'origin stories' (it really doesn't belong in a D&D game honestly, might just as well let us play the adventures of Drizzt if that's the case). But what can you do, hence I am really gonna experiment once we get access to origins in EA with what I wrote about Astarion. I hope that'll teach 'em.