>>543797242
Here I found it. This isn't a poll, but a survey study. There were papers and pdf posted with graphic and chart analysis. Not sure if it's available.
>Type-Moon characters with most doujin circles in Comiket dedicated to them (counted 2008 until 2018):
>1. Emiya
>2. Cu
>3. Shirou
>4. Kirei
>5. Gil
>6. Rin
>7. Kiritsugu
>8. Artoria
>9. Gudako
>10. Gudao
>11. Iskandar
>12. Kariya
>13. Gudas
>14. Waver
>15. Diarmuid
>16. Tokiomi
>17. Bazett
>18. Hakunon
>19. Romani
>20. Kayneth

>Note doesn't count other cons that are as big or important. Circles isn't amount of doujins, because most circles dedicated to characters push many.