I'm not trying to make a solid case for original fic here, just poking at your argument as I think about the issue.
Would individual creators be able to create tags for their own original characters?
Well, I've already done this for an OC in a fanfic, since it was the easiest way to collect all the stories I've written with that character (one of them is already in a series based around a different character and works can't be in more than one series at once) I don't know if there's instances of people using tags for other people's fic OCs they have then written their own fic about, but I wouldn't be surprised.
Something this conversation is increasingly reminding me of is the RPF/FPF argument: I don't read RPF, it doesn't tend to hit my fanfic buttons and also squicks me, and it's irritating when RPF comes up in my FPF searches (which it does constantly). But I don't see that as an argument for removing RPF from the archive.
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Would individual creators be able to create tags for their own original characters?
Well, I've already done this for an OC in a fanfic, since it was the easiest way to collect all the stories I've written with that character (one of them is already in a series based around a different character and works can't be in more than one series at once) I don't know if there's instances of people using tags for other people's fic OCs they have then written their own fic about, but I wouldn't be surprised.
Something this conversation is increasingly reminding me of is the RPF/FPF argument: I don't read RPF, it doesn't tend to hit my fanfic buttons and also squicks me, and it's irritating when RPF comes up in my FPF searches (which it does constantly). But I don't see that as an argument for removing RPF from the archive.