I noticed many of the posts of Yagokoro Eirin (from Touhou) lacking the "trigram" tag when displayed, as is typical of her clothes to carry some if not all of them. Sometimes they are even on her accessories.
Also, and more confusing, some posts of said character carry the trigram tag, even when it's nowhere to be found.
It's not a vital issue, as with the character properly tagged the basic level of tags is covered, but I want to raise awareness about the existence of this situation.