#3 Peyton Royce or Billie Kay
Yours truly thinks Peyton Royce is the frontrunner to win the vacated NXT Women's Championship at TakeOver: WarGames, which would mean that since champions are taken out of the equation for these elimination matches as they are busy fighting the other champions, it would be Billie Kay to fill this slot.
However, the Iconic Duo would just need to be represented in some fashion, and there's virtually no scenario where they wouldn't have one of them, if not both, on this team.
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Assuming someone else on this list were to capture the title, like Sane or Moon, then that would open up room for both Kay and Royce to be on Team NXT.
The Iconic Duo have been ready to be called up to the main roster for months and are undoubtedly the top heels in the women's division for the yellow brand, so their presence in this match would be a guarantee.