Astarion is definitely a victim, but I’m sure most people who do evil things are at some point.
I don’t think Astarion is irredeemably evil though. He was acting under duress and coercion for a long time, so he can’t really be expected to unlearn some very bad habits right away.
He and Wyll are my favorites from the new cast, so I’m really interested in seeing how their stories are handled.
