If I want spscific characters to die, should I do it? What I mean is, I don't like the idea of everyone surviving, then coming back in ME3. Who should I kill off on my team, and who should I let live, and how?
Here's a guide if you want to try to intentionally lose someone: http://images.wikia.com/masseffect/answers/images/8/87/Suisidemissionfinal8.jpg
I wouldn't suggest killing off Garrus, Tali, Legion, Mordin, Miranda, or Jack because they have really large or fairly large roles in ME3. The other 6 have minor, but game-altering, effects, so if you're looking for drama, with minor repercussions, those are the more expendable ones. Jacob, in particular. lol
Most of those characters are still expendable though because they are simply replaced by people you don't know in ME3. In other words, those roles are still mostly filled. Just by people that weren't squaddies in the previous games.