I think he's dressed as a girl because they don't want two possible heirs. If it was made ...

I think he's dressed as a girl because they don't want two possible heirs. If it was made public that he was a dude then that'll give him the change to surpass the "main" son which is a big no no. Also cause the mother will try and kill him cause of that.

Spoilers
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The purple hair dude knows that he's a guy and is a massive weirdo I my opinion