Hi,
It's strange to me that posts featuring Kumamon are often tagged as original, when Kumamon isn't the original character of most/any of the artists therein described; seems possibly symptomatic of pixiv posts being tagged as original over there when they're meant to be tagged with a copyright here, the hangup being that we don't have a dedicated copyright tag for Kumamoto Prefecture. Would it be in our interest to create a Kumamoto Prefecture copyright tag and grant these posts that tag? Might be better to manually remove outstanding "original" tags from there, as numerous posts with Kumamon do feature them alongside actual original characters.
Somewhat relatedly, should Kumamon posts be tagged with yuru-chara as well? Noticing many seem not to be.
Cheers.