>>536461754
at worst she'll be #6 if I had to guess if both of the twins surpass her, but it might be #4 is Kako, then Darumi, and then Ima, or #4 is Darumi and then the twins

It's hard to tell since the band merch of the twins in one store was flopping, but I also seen them drawn a lot. Weirdly Tsubasa was outselling them and that's weird because overall I would say Tsubasa ranks #9 or 10 at best in popularity