Ichirin
Ichirin (一輪) has multiple meanings, but on pixiv, it is most often used to refer to the character Ichirin Kumoi from Touhou Project.
Overview
Ichirin (一輪) is a tag is the given name of Ichirin Kumoi, a character from Touhou Project. There are many illustrations that are not tagged with the full name, so this one has more hits (by partial matches).
Related Articles
Touhou Touhou Project Undefined Fantastic Object Ichirin Kumoi
