Astarion is a corrupt and evil one that I ensure, he will against your grey or good path decisions, and then down his relationship very quick.
if you don't choose the evil path and you do not have the love to him, I strongly recommend you fire him during "the such blood event".
and if you think "Astarion might be not so bad", then you will be sorry about the decision, because you don't have any other chance to fire him after "the such blood event" in the early access.
It's not that I find him evil, in fact I don't find any of the companions evil, no matter their disapprovals. I always strive to making the camp as friendly and acceptable as I possibly can to all companions, I even let him suck my blood.
My opinion of him is that he is terribly inconsistent, but clearly a tortured soul. From being overly confident, to deeply reserved, to flirtatious and then outright murderous if you say the wrong thing. I fully understand every companion except Astarion, because he is all over the place with his feelings, so I can't pin-point yet the true Astarion. But I'm sure he will become very enjoyable once I get to know him better when the game releases.
