Personality aside, he's one heck of a rogue. Definitely one of the better built NPCs, in my opinion. Mechanically speaking, that is.
Also, for what it's worth, I don't think his apology is as fake as has been suggested.
+1 I take Astarion for his mechanics, not his winning personality. But I am intrigued to see where Larian takes Lae'zel and Astarion (hopefully not the same places they took Sebille, Fane, and Red Prince).
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