Magus said:
This example is only redundancy so long as no other Danbooru-relevant work has a character, location, weapon, vehicle, etc named Ganyu.
Agreed! So by that standard, she doesn't need a qualifier, as is the same for the rest of the characters in the BUR.
her name doesn't strike me as so unique for to make its recurrence in another work so unlikely we should discount it. And the same is true of the other Liyue characters with Chinese names.
I personally don't see how another copyright would be as audacious as to use the name "甘雨" (ganyu) for one of their characters. That would be an obvious rip-off. It's not impossible, but I don't think it's likely. That goes for the rest of the cast in my opinion, though of course I can't be sure about all of them. But all that said, both of our opinions are subjective. I don't think it's good to use subjective criteria to determine how to tag if it can be avoided.
As Chinese-made video games and cartoons with anime-inspired aesthetics (in other words, the types likely to have fanart submitted to Danbooru) continue to become more common, the odds of any given Chinese name being used again constantly increases.
This is true, but I don't think it's cause for too much concern. Danbooru already has thousands of Japanese copyrights, so this reality applies to Japanese works as well. In spite of that, there are only a few notable situations in which we need to worry about qualifiers. (Just for fun I looked up the most common Japanese surnames (Satou, Suzuki, Takahashi, and Tanaka) to see how many characters with those surnames ended up needing qualifiers, and the number was quite low.)
Even if the scenario that you mention is more likely than I think, the process of adding more Chinese names to the site will still happen over the scope of years, and it's not going to be too hard to adjust to.
I understand that people aren't as used to dealing with Chinese names on Danbooru as much as Japanese names, but let's not throw the baby out with the bathwater or use "It's Chinese" as a reason to break from usual convention.
It's better to stick with a two-step process:
Is the canonical name duplicated?
Yes: Add a qualifier
No:
Does the canonical name belong to a list of categories that have reasonable grounds to need a qualifier? (as mentioned before, historical and mythological references, etc.)
Yes: add a qualifier
No:
Use the plain canonical name
This process should cover any character tags present and future.