Oozora, Hibari

大空ひばり

Hibari is the sole biological son of a Yakuza boss, identifies as female, and has three sisters. She presents as female in public, which her father despises; he calls her a pervert (hentai) for this reason. Hibari is defined by her beauty and wit, and she can also defeat nearly everyone in a fight.
Hibari falls in love with Kousaku (the main hero) upon seeing him, and continues to tease him even after Kousaku learns that Hibari is physically male and thus rejects her.
Hibari is also her school's idol, excelling in both sports and grades. She has Shiina, one of her classmates, as a main unrequited admirer.