Who is currently the most popular anime girl? Do not include anime girls that were in anime made before year of the lord 2015. Basi it on number of sold fan items like anime figurines, posters, pillows and similar items that have the anime girl in question on them or are them.
Most companies that sell anime merchandise do not release detailed sales figures, merchandise is sold by numerous vendors, and popularity may vary greatly by geographic region, so this question is difficult to answer precisely. That being said, the top 3 anime girls with the highest body pillow sales volume on Amazon are listed below. This list has been filtered to exclude girls from anime that first aired prior to 2015 (such as Mikasa Ackerman).
1) Nezuko, from Demon Slayer
2) Marin Kitagawa, from My Dress-Up Darling
3) Zero Two, from Darling in the FRANXX

Note that there are multiple ways of quantifying popularity, and the #1 girl by some metrics may not appear in the list above. For example, the most favorited girl on the website MyAnimeList from an anime that first aired after 2015 is Rem from Re:Zero. However, her body pillow sales volume is less than half Nezuko's.
Where can I find the sales figures that you are using?