It always bugged me how cyclops is used as a catch-all term for one-eyed characters (as in, single eye, not missing one) instead of referring to the Greek monsters as the wiki entry does. Since Pixiv already makes that distinction with the モノアイ tag, would it be possible to create a parallel one on Danbooru?
EDIT: Actually, I took a look and it might be faster to just bulk update the tag to mono-eye, because aside from cyclops_(monster_musume) and cyclops_(monster_girl_encyclopedia) I saw nothing based on actual cyclopi.
Updated