A lot of series have smaller copyright tags drawn by umbrella tags, for example Fire Emblem, Fate, Xenoblade...
While this is helpful, this also harms copytags: searches, since they will inevitably be counted as two copyrights or more.
My suggestion was to add a "modifier" to certain copyright tags (or character tags, if we count character umbrella tags too) in order to make them not count towards copytags: searches.
Of course implementing it like this could be harmful, whether someone wants to find unspecified crossovers between two games of the same series or outside the series.
I do think it should at least be kept in mind for the future though, in case a better solution comes up.