The related tags list is failing fully convey "related tags" and I have a simple way of addressing it. Two things that I have noticed about the related tags is that it often misses really useful tags that might be easily forgotten, and sometimes lists a few strange things.
Right now I am reading a list of suggested tags for izayoi_sakuya. Some tags which I am noticing are missing are frills, puffy_sleeves, and thigh_holster. I'm also noticing remilia_scarlet and monochrome. Nearly every touhou character has frills, including izayoi_sakuya, why then doesn't it show up under related tags? Well, because people don't tag it enough for the system to see the high incidence. puffy_sleeves and thigh_holster are in the same boat, and I'd find all three of these important as an artist in search of reference images. remilia_scarlet is a fair related tag in that the two are often pictured together; however, Sakuya does not actually necesitate remilia_scarlet, its just that people like to see these two together. monochrome is a bit of a myster to me, because I simply don't know where that corrolation would come from. For the most part I see this happening for characters and their common outfit.
To solve this I would simply suggest a habbit of listing some related tags in the wiki entries for characters, or what ever other tags have such a relation. This mostly plays the roll of the "See Also" lists that some wiki articles; however, "See Also" lists more alternatives rather then what I'm talking about. Such a list could also then be displayed in the tagging interface but it need not be.
What do people think of this idea? Do I even need to people's permission to start making things like these?