the ability to multiclass into a Barbarian (haha)
Barbarian/rogue is awesome in 5e.
Yeah, it seems like a really cool combo. I think he was mostly just laughing at the idea of astarion as a barbarian lol.
100% this. Astarion's definitely the most posh companion IMO and picturing him as a raging barbarian made me chuckle. Barring a proper character arc, it does feel off to me though from a RP standpoint.
Mechanically, Barbarian/Rogue in 5e is indeed a strong combo. I don't know if it'll be as good in BG3 currently, since you don't really need Reckless Attack as much to gain advantage.