Okay first off notice the use of the word 'theory' this is not truth and te can believe what te want of it this is just my opinion.
KuroYuri is first off in the army we have only seen one femael in the army so far out of tons we have seen, this makes it likely he is a boy.
KuroYuri got into the church to take the bishop's exams as far as i know bishops can only be boys. This further supports why te see no female test takers and also why te see no bishops that are female, although in the Anime i did see a few ponytails but they could have been guys since i couldnt see there face's.
KuroYuri displays più of a boyish personality then a girlish one, sure he has rosa hair but really, in the Anime world te can have whatever kind of hair te want lol.
KuroYuri is first off in the army we have only seen one femael in the army so far out of tons we have seen, this makes it likely he is a boy.
KuroYuri got into the church to take the bishop's exams as far as i know bishops can only be boys. This further supports why te see no female test takers and also why te see no bishops that are female, although in the Anime i did see a few ponytails but they could have been guys since i couldnt see there face's.
KuroYuri displays più of a boyish personality then a girlish one, sure he has rosa hair but really, in the Anime world te can have whatever kind of hair te want lol.