malymin

As of me typing this, there's 997 fanworks in the "Princess Tutu" category on Ao3.

Now, keeping in mind that a fic can be tagged with multiple characters (and thus these percentages add up to more than 100%), let's look at the popularity of the central characters around whom much of the drama focuses.

75% of all fics are tagged with Duck/Ahiru in some capacity. No surprise, she's the protagonist.
72% of all fics are tagged with Fakir in some capacity. He's one of the four main characters.
35% of all fics are tagged with Rue in some capacity. She's one of the four main characters.
34% of all fics are tagged with Mytho in some capacity. He's one of the four main characters.

Then, let's look at ships.

56% of it is tagged Duck/Ahiru x Fakir. This is the most popular ship.
18% of it is tagged as Mytho x Rue, the other canon endgame ship. This is the second most popular ship.
Every other ship's numbers - M/M ships, F/F ships, alternate M/F pairings, etc - are doing even worse.

It's... very disproportionate.