You might have been asked this before and I'm sorry if you have, but could you please explain to me why kalluto and alluka are constantly referred to as boys.
Kalluto is referred to as a boy because he is a boy. He has quite a pretty face, and wears yukata which is typically a feminine item of clothing, but he is confirmed as male.
Alluka however is a girl. She is biologically male, but identifies as female, and should be referred to as such. The reason llumi said she was his brother is because he and others don’t respect that and refer to her as male, her family don’t even regard her as a human being. Some viewers do this too. The HxH wiki also does the same, which causes confusion and misunderstand for people who are wondering.