I just beat it for the first time (a little late, I know), but I'm on my second play-through and I remembered Wrex killing Fist when we stormed Chora's Den. This time I brought Garrus and Ashley with me and I was given the choice to spare him. So I'm thinking there were probably other situations in the game where having (or not having) a specific character in your squad will affect certain scenes. Apart from the character specific assignments, what are the scenes affected and by which character? I want to see the majority of the content but I rarely ever play an RPG more than twice. Any information will help

I don't think you have a repeat of that in ME2. Where the outcome is taken out of your hands, tbh. The most you'll get is different comments, and team mates who will agree or disagree with whatever steps taken or decisions made. The exception of course would be the final mission where who you pick to do what has a huge impact on immediate events.

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Sorry, my wording was a little off, I haven't played ME2 yet, I haven't even picked it up, I'm playing through the first one a second time to see different outcomes, but there may be to many to count and I don't really want to load a save and go through a mission with a different squad all over again just to have slightly different dialogue. Really all I'm looking for is scenes that have significant changes based on your squad, like the Wrex-Fist example above =)

if you take Liara to Noveria, she has unique dialogue with her mother. in the very very beginning, before you get your spectre status, there's a scene you can get with Kaidan and Ashley at the balcony between markets and med center. but it disappears after you become spectre. if you start a romance and don't turn in consort's quests, only to come back once the romance had some time to progress, bring your LI with you, and then take Shai'ra's ...offer, LI will act jealously. you can eventually dance with your LI at flux. if Ashley is with you, when you talk to Samesh Batia, she talks to him about serving with his wife and implores you to help him.

some characters get a bit of unique dialogue here and there (Wrex and Kaidan get some nice gems on Noveria, though sadly, not together - in ME1, some squadmates take precedence over others, and I STILL haven't figured out exactly how)

that's what I can think off, for now

P.S. other then Wrex shooting Fist, I don't beleive there are other instances where whom you have with you, matters THAt much. its mostly for flavor.

^ I think jeweledleah just about summed up the lot, there. Also, here's a link to a wiki that'll give you the unique dialogue of each squad mate. Obviously this will spoil what they say and where, but nontheless:

Unique dialogue - Mass Effect Wiki - Mass Effect, Mass Effect 2, walkthroughs and more

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Thanks, this helped a lot =)