I agree that I should do something to show the total number of rikishi in each basho. (almost 1000 in the 90th, 676 now).
I also agree that the sekitori ranks are the most interesting, but I made the emphasis equal over all divisions for 2 main reasons.
1. I want the graphs to show some sort of reality between how many rikishi is in the respective division (Compare the Mercator map projection, which makes many people think northen and sothern countries are bigger than they really are). The graphs are zoomable so to emphasize makuuchi you can just zoom in there.
2. I usually go to Japan about once a year to see a basho. I like to go early and watch the lower divisions. But I noticed that I don't really know much about the lower ranked rikishi. I can of course get info from Sumo reference and other sites, but I wanted to be able to compare rikishi easily on one webpage with just one click (That's when I thought about making a site like this, 3 years ago). So the page is for comparing rikishi of any rank equally.
So, besides from choosing rikishi form the banzuke to plot, I want to make it so that during a basho you can choose a matchup and see the 2 rikishi plotted.
Bilingual would be good
Add some css to make the site prettier
Not tested on touch screen, but Reset button might be too close and pressed on accident.
As of now, data goes back to 1997 (I wanted to fit Aminishiki in), but it is not a priority right now to go further back, emphasis is on current rikishi.
PS. I'm just a mediocre hobby programmer so updating might take some time.