Rozen Maiden was quite popular in the 2000's. Couldn't go to /a/ without a picture of Suiseiseki and maybe Suigintou floating around along with perennial it girls Ayanami, Saber, Haruhi, and Rena. I suppose the series has simply run its course by now in the 2020's, though I've heard they still release special editions and stuff in Japan.
I'll always be fond of the series, thanks to the anime and the awesome fansubs from back in the day.