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As someone who reads a lot of Pokemon fic, especially gameverse, I often find myself in the mood to read a certain character as the "protag", since we have cases where some characters are either the rival or the protagonist. And I'd love to be able to filter by that!
So I propose making a common tag convention on Ao3 that we could follow when writing and tagging fic. My ideas were something like "Protag Teru | Rei" or "Teru | Rei is the Protagonist". We could also have tags like "Rival Haruka | May" or "Haruka | May is the Rival".
Of course, there's no obligation to do so, but I think it would be a useful tag, especially for less common choices of protag/rival assignment. (And things like the secret third option of both characters being protags can be conveyed by tagging both!)