That makes sense. Kuja does look like a girl. You know that one movie when Kuja sends his eidolon on Brahne? He looks like a girl when he puts his hand on his chin and smiles.
Stop asking this question. He is male. It is true he looks more feminine than Steiner, and yes, he wears unique clothes, but he is male, and there is no doubt about that.
No character in the game has doubts about it. And frankly, he doesn’t look female. If he was female, everyone would complain about him looking too masculine. Now. Really. Think of less obvious questions to ask. 😛
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But damn they could at least made his character less feminine if they wanted him to be a male.