Backed by topic #20385 (I created the topic to dmail it to people) I correct Fate copy taggings here and there. Most Kingprotea posts have Fate/EXTRA CCC, she's mentioned in the game, but got cut from development. She first appeared in Fate/EXTRA CCC Fox Tail and later in Fate/Grand Order. Most people didn't play CCC, so this the Wikia citing part of the Fate/EXTRA material.
This is to say I plan to add the FoxTail tag, though it implicates the game, to ambiguous images. If someone has any objections, hit me up.
Edit: Same for Kazuradrop and Violet.
Updated