I've been trolling around some Torchwood Archives looking for fic and I have to say, going by descriptions there is an astonishing amount of Mary Sue out there in the TW fandom.
On the other hand there is this wonderful fic by
copperbadge which is a textbook example of how to introduce an OC for an outside point of view without even the slightest hint of Mary Sue (or in this case Marty Stu).
On the other hand there is this wonderful fic by
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