The easy answer is all of them.
Of course, the question is a bit more than that. I'm working on a character for a Shadowrun game (a friend of mine decided he wanted to run it instead of the DnD that we was going to run). I've been going with the fact that there are two images that were from the 3rd Ed book that I liked a lot and evoked image of a character. The first was the Face and the other was the Covert Ops Specialist.
I started out combining the two pictures with a magic using character and found that I was far short of the points that I would need, especially since computer skills are very good for the B&E stuff. So I dropped Covert Ops Specialist from the roster and am left with a magic using Face.
As I have been sifting through the books to try and piece the character together I have been getting a history in my mind as the Negative Qualities jump out at me. This is a pretty brief run down on what I have seen for her history, skipping lots of the parts that don't deal with my question.
I saw her as a corporate spokesperson (her Charisma coming through) who ended up stumbling on to too much information on a project being run by the company. She made her objections known, and was just about to bring some of the operation to light to one of her superiors when she was taken by the corp.
She wakes up, years later on the street. She doesn't know where she is or why she is there and has no memory of the time that has passed or the events leading up to it (discovery of Project 42). She tries to reconnect with her old life to find that she is 'Dead' and her husband (Who she used to run a small company with but they were bought out by a larger company that she had problems with. He was the brains behind some big Biotech advancement and the company got picked up because of that) is dead. She heads into her old employer only to find that they are less than welcoming to her return and some corp security try to pick her up (restraining, not killing).
She escapes from them and goes to ground, not something that she is very familiar with. She finds that the years have passed and that her friends have left her behind long ago (the whole 'Dead' part). With nowhere to go and a powerful corp on the lookout for her she has little that she can do and ends up turning to the shadows to track down what has happened to her husband.
I am looking for a corp that is going to be into BioEngineering, Genetics...those kinds of things. It can be mystical or mundane, but I have petnamed what she took offense to as Project 42 (Because it is the Ultimate Answer to the Ultimate Question of Life, The Universe, and Everything) and believe that they were using the SINless as fuel/lab rats/something bad for Project 42.
I read through the MegaCorps and found Evo seemed to be the most likely candidate for something like this, but wasn't sure if there might be other corps (maybe not Megas) that this might fit better with.