So yaaay, I finally finished my quest of tagging chartags:1 images with *girl and *boy tags. There are still about a thousand images left, but I don't know what to do with those.
My query was chartags:1 -1girl -1boy -multiple_girls -no_humans -multiple_boys -comic -crona_(soul_eater) -ushiromiya_lion -inga -tarutaru.
Tarutaru are there because of fujiwara_akina. He draws them a lot, and I just can't identify their gender in his images.
Inga is some character whose gender is not identified as well as crona_(soul_eater) and ushiromiya_lion. There might be more though, but I tried to be careful.
Then, about what is left. There are some androids from Rockman series and some other series as well - I don't know if they require a gender tag. There are also full-armored guys, like the ones from Dark Souls (I'm not sure whether they are actually humanoid under the armor).
Then pictures like post #1483300 with only isolated body parts and pictures like post #1378698 , which I can't tag as no_human, since there is a hand.
There are also characters like jissouseki, I'm not sure whether they are humanoid. And I think finally there are moemon pics with personifications, where I can't understand the genders.
So, I'd like someone to help clear those up. I might have messed up with some traps and things like 1girl multiple_girls, but I'll be working on that now.