Matsuura, Yuu

松浦遊

Yuu is the series' primary male protagonist and title character, earning the "Marmalade Boy" nickname from Miki because she views him as resembling marmalade—handsome but bitter.
In contrast to Miki, Yuu's personality is nearly the opposite; he tends to be more aloof, less emotional, and less forthcoming with his feelings. He acknowledges that he admires Miki's capacity to express her emotions openly, noting it as one of the reasons he fell in love with her. Throughout the series, many characters remark on his excellent "poker face." Yuu is naturally athletic and intelligent, excelling in nearly every sport. His ambition is to become an architect, which leads him to attend St. Andrews High School for his studies. While Yuu frequently teases Miki, this behavior serves as his method of showing affection. Although his first kiss with Miki catches her completely off guard, the Marmalade Boy Movie—a prequel to the TV series—reveals that Yuu had fallen in love with Miki before they ever met. A few days before the fateful dinner, he spotted Miki while she was out and followed her, observing her interactions with the Gastman Team.