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i am serious about this
I think the rubric for tagging characters in AO3 should be: if they have enough of a significant role that someone could look back at the story afterwards and go 'that's my favorite character in the whole fic!' then tag them. otherwise no.
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Oh, fandom. You are difficult. I should probably tag more on stuff like kink fic and PWPs and tag less on huge epics, but in practice my tagging tends to be "how much effort do I want to go into at the exact instant I am posting something".
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---Of course, this wouldn't be necessary if AO3 would add a way for authors to distinguish 'main characters of story' from 'briefly appearing side characters in story' to their story info system.