A female character with male genitalia.
In the context of Danbooru, the image does not need to directly show whether or not they have female genitalia. If you can visually confirm the lack of a vagina, tag newhalf. If you can visually confirm a vagina, penis, and testicles, tag full-package futanari.
It is not related to transgender or intersex, but is purely fantasy-based.
Futanari is not to be tagged with either hetero, yuri or yaoi.