so I was curious about it, and I did some little research!
(please note I did research only Piapro characters from 2007 to today, and also in some cases, the numbers are not meant to be exclusive to one character, but for example a song can be a duet and so have 2 characters in the tags, or an artwork with a group theme)
niconico video:
:464.682
:86.595
:59.858
:54.952
:53.747
:29.472
pixiv artworks:
:640.077
:137.323
:105.165
:69.515
:52.069
:25.350
piapro songs:
:97.765
:16.705
:12.002
:11.611
:5.731
:3.537
piapro artworks:
:183.650
:66.284
:57.450
:45.263
:25.114
:20.452
AmiAmi shop goods:
:5.075
:726
:659
:641
:535
:521
(please note I did research only Piapro characters from 2007 to today, and also in some cases, the numbers are not meant to be exclusive to one character, but for example a song can be a duet and so have 2 characters in the tags, or an artwork with a group theme)
niconico video:
:464.682:86.595:59.858:54.952:53.747:29.472pixiv artworks:
:640.077:137.323:105.165:69.515:52.069:25.350piapro songs:
:97.765:16.705:12.002:11.611:5.731:3.537piapro artworks:
:183.650:66.284:57.450:45.263:25.114:20.452AmiAmi shop goods:
:5.075:726:659:641:535:521
