ninryu said:
Edit: so we tag fictional characters based on their non-existent chromosomes?
How does that make sense?
It´s pretty hard to tell if any character is identifies him-/herself as something other than the biological sex and I would say that the majority doesn´t know this. Also you shouldn´t be that mad about tagging a picture because of the sex, as it´s just there for searching reasons. If you think that a character identifies as a gender opposing to his sex, than you could also - while providing some source to this? - write it into his wiki.
We´re not here to talk about politics in tagging, as it is hard to tell what is what, so going for the sex than the gender is pretty easy for every new and older uploader and tagger. If it becomes a major thing, maybe a pool would be possible, as it is hard to tag the gender?
The problem would be, if there is a explicit dororo post with him/her, depicting genitals. Showing her genital, not seeing any boy-parts, you would instantly tag it as 1girl, as it is logical.