This is a genuine question: how on earth are we expected to 'recognise' a character as non-binary.
Men, I understand; women, I get; men or women obviously dressing/presenting as (a stereotype of) the opposite sex, I see what they're driving at.
But what does somebody identifying as non-binary look like? I presume they would have to insert it prominently into the script, to tell the audience (before they yawn and think 'just get on with the play, will you'), which seems kind of odd and distracting.
You wouldn't have a character randomly telling you their favourite colour, or whether they prefer chips or jacket potatoes, or what kind of music they like, or what car they drive, or which bank they have an account with, or whether they have an iPhone or an Android, or where they do their shopping - unless any of this was actually somehow relevant to the character or play.
Aside from the fact that none of us is 'gender' binary inasmuch as we like/act/do ONLY things that stereotypical men or women would do; however we are, of course, binary when it comes to our biological sex, as we are humans and that is a basic immutable fact about humans.
I really am struggling to understand what people - real people as much as characters in a play or film - actually want us to say or do when they tell us they are non-binary. How are we meant to react, other than with a "That's nice for you, dear" - as we would when a 3yo tells us that they ARE Elsa, Fireman Sam, a crocodile or whatever?