Last month, I did some analysis on the entirety of Touhou posts on Danbooru that I wanted to share since it was illuminating to me, and it might provide insight and generate conversation among others as well.
The primary motivator for this was that the EoSD characters have the highest post counts, and it seems like the newer characters could just never catch up. I wanted to try normalizing the data and account for the longevity when looking at the total post counts.
So, I used the number of months since a character was released for normalization. Even though Danbooru wasn't around when the first couple of games were released, the characters in those games have been around, making an impact with artists that have generated artwork. Just as an aside, I didn't include the more recent games since their numbers haven't settled down yet.
One thing to note about Reimu and Marisa is that I used the time since they were released in EoSD as the normalizer, since using the PC-98 dates gave them too much of a penalty, and they were no longer in the top positions anymore, which doesn't make a whole lot of sense for the main characters of the series.
I also included the Coefficent of Variation to show which games had the most variance between the characters.
Updated