To consider the title of this thread, we should count who we know have been taken over by Nemesis and add names who could have been infested to hopefully get a better picture of who the 13 puppets are or were.
Aurora, Lea, Maeve, Cat Sith and Justine make five. Who else should we consider adding to the list? I think there are a fair number of people; and not people, to consider, even if we don't add all of them.
Victor Sells, Kravos the Nightmare; before he turned himself in a ghost, Mr. Ferro, the Red King, either Tessa or Rosanna, Cowl, Mavra and Elaine or someone currently on the White Council.
Someone or something corrupted Victor Sells and Kravos. There is nothing to definitively prove they were Nemesis puppets but they still have to be considered possibilities.
Mr. Ferro received a gift at Bianca's party as did Lea.
Nicodemus told Harry that someone on Tessa's crew was taken.
Why do I include the Red King, Mavra, Cowl, Elaine and think someone on the White Council could be or have been a Nemesis puppet? I think; I'm guessing, at least one individual from or close to every major faction has been taken. It's good strategy. Why go after one or two factions strong enough to oppose you when you can go after all of them?
Way back in the old forum I remember someone putting forth the idea that the Red King had been taken. The evidence they claimed backed this idea up was part of the conversation between Harry and the Red King. Something the Red King said about Arianna not being open to new possibilities.
Mavra? We know the Black Court are tied up with Outsiders. Harry guessed that in his last conversation with Lash. But like the White Court of vampires, maybe the Black Court has a relationship with Outsiders, but Nemesis needed more than that. Nemesis needed someone, something? on the inside to better control the Black Court. Isn't it odd that Mavra was the weakest of the crew Drakul sent to Chicago, but she was smarter than the rest of Drakul's crew?
Cowl? Why not. It makes sense seeing as Cowl had been doing so many things to help Nemesis.
Elaine? Jim has suggested she is not Kumori. Someone had to infect Aurora. That makes Elaine a candidate.
This makes nine candidates for a total of eight positions. I think most of them are or were Outsiders puppets. Aurora, Maeve and the Red King are dead and Lea is cured. Victor Sells and Kravos are dead. Justine has been neutralized. It is possible that five Nemesis puppets are dead and two have or are on the way to becoming to being cured. That would leave six left, at a minimum.