GameRager: And if you knew what some companions liked you could manipulate it while staying true to your alignment as much as possible and still get their benefits/extra dialog.
muddysneakers: Does 2 have the same companions?
Some, as well as some new ones.
One new one you get depends on your s*x/gender(the game picks from two who will stay with you on your journey).........if you are male you get the female one(as part of the locked in early on missions), and if you are female you get the male one(during one of the planets from the first game, after the early on locked in missions are over).
*Spoilers on who comes back* You get the small droid back and he talks more this time around, and the big droid as well.....but the big droid you only get by finding/buying parts on most worlds to rebuild him, so when you can use him depends on how you play the game. Carth shows up but only in cutscenes as an NPC for the most part. IIRC most of the others are absent, with new ones filling various roles and added during some planets/events.
*End spoilers* Also as others said there is an influence dialog system. Some actions you take while with some companions will make them happier/less happy and as a result they will share less dialog/etc with you depending on what you do/say to them and others while they are in your party or while talking to them at your base/ship.
You get new lore/dialog opened up if you influence them enough plus some stats increases and skills sometimes as well with some of them, so it pays to try to manipulate them(via saying what they want to hear when talking to them on the ship/etc) to get such.
(Also one player will be "with" you always in a sense[even when not in your party], and it's usually best to keep that in mind when they "talk" to you at some moments when you choose how to reply to them)