Actually, I am a little surprised so much Naruto fic made the list as I did not think it was that active of a fandom on AO3. I do not understand the Kakashi ( or Iruka) appeal either, but I can understand true appeal of your writing.... :) All my remixes or yuletides usually have more hits too. A built in audience....

It would be an interesting to see the lists for lj and ff.net just because I find all three sites seem to have different audiences.