Something like that. Basically it shows all the stuff the Author inputted about the story.
For the sets I meant instead of just having two characters listed, you have the option for groups of two. Normally it's characters A and B. By adding the sets you can have C and D also finding the same story, but they have to work as a set so A and C and B and D don't pull up the story as well. It wouldn't matter if it's used to set up multiple pairings for one person, but when you want to have certain pairings it matters. People that like Naruto/Hinata and Sasuke/Sakura do not typically like them being swapped. It should be possible to click to add sets of characters.
I suppose you could add in a character list that works similar to how deviantart sorts things. You pick the subject, anime, book, etc, the series, then the character. It can by default be set to the main fandom, and if they want to change it, they click it. It can be done, just takes some planning.
Originally, I meant that you add in harem, X-over char and probably OC to the sets for each series. They would look like A/harem, A/X-over character, or A/OC. This option is much easier than the all encompassing fandom list.