I'd really, really like to see Canon Divergence make the genre list! If you're worried about it being too vague, you could perhaps split it into a few different ones? Like "fix-it" and, uh, I dunno, "bad ending"? There are some fandoms I'd want to request fix-it for, so I'd be over the moon if I could actually choose it as a genre.
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As for other genres, how about "humor"?