So, after some discussion with Hiku, here's what I've figured out for Garrus:
-He'll be affected by the pulse and he will very quickly begin descending into all-out paranoia and jumpiness.
-He'll start talking to two groups of hallucinations. One will be "dead" Shepard from when she died the first time, who will be convincing him that his Shepard is really a clone. And that he needs to kill her before she kills him or hands them all over to Cerberus for experiments. This will extend to the point where he starts seeing almost everyone as a Shepard clone and he's going to end up in a tower somewhere, shooting at people a la Ned Flanders from that one scene in the Simpsons. This is going to really fuck with him emotionally.
The second hallucination(s) will be his dead squadmates (which may or may not include Sidonis) who will be simply talking to him at first. After a while, they'll start trying to convince him to commit suicide to make up for his "failure" at leading them or protecting them. This may or may not end up going through, but there will probably be a Turian necromorph.
Re: Let's have some general planning up in here:
-He'll be affected by the pulse and he will very quickly begin descending into all-out paranoia and jumpiness.
-He'll start talking to two groups of hallucinations. One will be "dead" Shepard from when she died the first time, who will be convincing him that his Shepard is really a clone. And that he needs to kill her before she kills him or hands them all over to Cerberus for experiments. This will extend to the point where he starts seeing almost everyone as a Shepard clone and he's going to end up in a tower somewhere, shooting at people a la Ned Flanders from that one scene in the Simpsons. This is going to really fuck with him emotionally.
The second hallucination(s) will be his dead squadmates (which may or may not include Sidonis) who will be simply talking to him at first. After a while, they'll start trying to convince him to commit suicide to make up for his "failure" at leading them or protecting them. This may or may not end up going through, but there will probably be a Turian necromorph.
So yeah. Good times.