After a somewhat disappointing first playthrough of Mass Effect some years ago, I gave it another go and it was so inspiring I feel like going through it again. And again. Of course I'll be going through it with ME2 and, eventually, 3 in mind, so I'd like to amass a pool of characters for this.
How does the character importing work? Does it only do decisions or class as well? For example, if I import my Soldier will it only import what decisions I made or will I have to play as a soldier in ME2 as well? Is there any way to only import decisions?
The second thing is, if the answer to class importing is yes, how exactly does that work? In ME1 if you had one playthrough as a Biotic and one as a Soldier, you can pick additional abilities from those trees if you play, let's say a Vanguard. I assume you also only unlock this after a playthrough with one of the base classes on ME2, so if I want to import a hypothetical Vanguard, after having played through as both soldier and biotic on ME1, will it still be vanilla Van in ME2 or will I have the option to pick the additional abilities?