Seems to be a lot of different tags of this type now. Originally there was only dual_persona, and while it's kind of inaccurate for "dual", I used this one a good bit for 3+ forms of a character since I didn't really think there was a need for more tags. Should it be restricted to just 2?
multiple_persona - Kind of ambiguous. It could be two or more, unless we want to keep 2/dual separate. If keeping 3/triple separate, then it has to be 4 or more. I'd kind of like at least one "catch-all" tag, though, so if "dual_persona" can't be used for 3 or more, then I'd like this to be used for all 2+ images (by way of implication).
triple_persona - This one would only be used when there's exactly three forms. Pretty straightforward, though may not be necessary as a separate tag.
quadruple_persona - Also straightforward, though this one really doesn't seem necessary as a separate tag.
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