I agree that any could work. You could even have hours of fun creating them all, and just play through the prologue with them all and see which one grabs you most.
Personally, though, for a first playthrough I think the Bard has the advantage of being a class that's likely to be curious and talk to everyone and pass dialogue checks, so you can roleplay while also as a player feel justified in exploring as much of the game as possible. But of course, you could do that with any class if you liked
