>>49945534
I don't know if I believe that Koharu was the most popular ever. She certainly had her 15min though. In all recent heisai era idol reviews ive seen, koharu doesnt even clock in the top 20. Maki is usually voted as one of the most popular idols of the heisei.

https://daydaynews.cc/en/hotcomm/1796965.html

https://m.youtube.com/watch?v=z_YtwpsL1gA