Thanks for the question. No, I'd prefer tags indicate definite character preference. My philosophy is that that's what's most effective to ensure that a person who offers a tag and a person who requests that tag have the same expectations.
My issue is mostly with the 'any', though. Please feel free to nominate, say, "Harry Potter & Other Hogwarts Students". Perhaps that seems like quibbling, but if so, I hope it's close enough to work for you. Or, if you simply nominate Harry Potter as a character by himself, and give prompts involving other Hogwarts characters as well, I expect that would work. In 10,000 words of story or a long comic it's certainly possible to write Harry interacting with no characters who were or are students at Hogwarts with him, but it seems as if it would be harder to do that than to include them.
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My issue is mostly with the 'any', though. Please feel free to nominate, say, "Harry Potter & Other Hogwarts Students". Perhaps that seems like quibbling, but if so, I hope it's close enough to work for you. Or, if you simply nominate Harry Potter as a character by himself, and give prompts involving other Hogwarts characters as well, I expect that would work. In 10,000 words of story or a long comic it's certainly possible to write Harry interacting with no characters who were or are students at Hogwarts with him, but it seems as if it would be harder to do that than to include them.