Hello I am an admin on the Yuripedia wiki and have started deleting files that aren't being used in any category. Another editor of the wiki objected and I explained my initial thoughts on the matter, however thinking about it again I'm not sure this was the best response in this situation (our wiki currently doesn't have any drafted policies so I didn't have anything to reference).
Thanks for the advice. I've gone through and restored many of the images that I deleted. The ones with letterboxing or otherwise were low quality or duplicates (with better quality images on the wikia) were left deleted however.