Hibari "Hibari-kun" Oozora
About
Hibari falls in love with Kousaku (the main hero) as soon as he sees him, and continues to tease him even after Kousaku learns that Hibari is indeed male and thus rejects him.
Hibari is also the idol of the school where he goes disguised fully as female, and he is excellent both in sports and grades. He has as main - unrequited - admirer Shiina, one of his classmates.