I know this suggestion was dropped a while ago but I honestly agree that fanart should be taken off the character pages and then put in the relevant illustrator's page, if they have one. The character galleries on the articles themselves should be used for official art only. I feel like this is even more imperative when it comes to official illustrator's fanart because then it blurs the lines for fans, not knowing what's actually creator endorsed versus what's really just their own speculation.
Like the image of Seth holding the stuffed cat--that's not an actual thing, that's just what Ichika imagines it was like. But because it's her, it looks official enough that some people may get confused. Especially if details later arrive that contradict what's in it.
It's kind of like the equivalent of putting fan theories in the trivia section. Not to mention the problem being discussed that it leads to massive "misc" pages.