@h8GWbush Is that so? But isn't the tag rule "tag what you see"? So it should be tagged with a cosplay tag as well? This is the problem of aliasing though. To begin with "mysterious heroine X" should have her own character tag. But the problem is that Artoria seems to be aliased with Saber. So if you do a search for "Saber" you get all Artoria,even ones that are not Sabers (as in the case of Mysterious Heroine X and her alter)
Further complicating things if say it is a "tag what you see", then it would be correct to tag it as "Mysterious Heroine X" even if it was just a cosplay, but if Mysterious Heroine X is aliased to Artoria, then any such entries would get the Artoria tag as well/instead.
Anyway, you should bring it up on the forums. No mods or admins browse the comment fields. The comment section on this site is cancer and it is even encouraged and supported by the site itself for users to "make hits" on each other and censor shit they disagree with or just for the lulz.