There are basically two purposes for the different Number 2s.
The first is to help maintain the facade of the purpose of the Village, which is to break #6 into giving the real reasons for why he resigned and to resign himself to the comfort of the Village itself. Pitting 6 against different 2s keeps him guessing as to what tactic the Village will use.
The second is a little more subtle. I see #2 as a bit of a demon of the Id, the dark subconscious. That, really, it doesn't matter who #2 is, because he is merely a construct of the Id in 6's own mind. In most of the cases where #2 is employed, he or she is trying to make 6 feel comfortable with his environment to the point where he feels obliged to tell them why he resigned, but this is a ploy that 6 eventually uncovers. What's really going on here is #2 is changing his face and persona in order to get #6 to believe that possibly that the Village itself, and the apparatus behind it, can change according to his liking.
In other words, 2 is 6's rationalization for his conscience (remember, 6 always says that he resigned as a matter of conscience). 2 serves a dual purpose in that he's both a focus for 6's antagonism to the Society, the powers that this represents, and for 6's own desire to find any sort of escape, even if it means changing the Village to suit his liking. It cannot work though because the Village, I believe, represents a facade of a society that he doesn't care for, for reasons only 6 knows.
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