While I was looking for Japanese names, I stumble upon the knowledge that "Hibiki" is a boy's name. That, and somewhere here i've read that she doesn't like female clothing (?) makes me wanna ask some questions:
Is she a bokukko?
What other male qualities does Hibiki possess?
What's the reason behind Hibiki being boy-ish?
Is her liking pets a sign of her femininity or masculinity?