Hayato Ike attends Misaki Municipal High School as Yūji Sakai's longtime friend since middle school, consistently appearing throughout the series. Peers recognize his intelligence and calm demeanor, dubbing him "Glasses Man" or "Megane-man." His typical appearance features brown hair, blue eyes, and glasses, often framed by the school uniform.

He blends analytical thinking with emotional perceptiveness, demonstrating strong loyalty, particularly to Yūji, even while harboring unrequited feelings for their classmate Kazumi Yoshida. Despite his affection, he frequently supports Kazumi in expressing her feelings toward Yūji, prioritizing their friendship over his own desires. This creates occasional inner conflict, though he rarely acts directly on his feelings—exceptions include inviting Kazumi to assist with student council tasks. His emotional awareness contrasts with Yūji's obliviousness; Hayato often points out how Yūji's actions inadvertently hurt others like Shana or Kazumi.

Serving as a committee member for Class 1-2, he balances academics with student council duties, leading to limited free time. He suffers severe motion sickness, reacting adversely to buses, roller coasters, and most rides—though he once managed a Ferris wheel in childhood. During school festivals, council responsibilities, often involving fellow member Harumi Fujita, frequently occupy him.

Toward the end of the first season, his character development intensifies as he confronts his feelings for Kazumi. On Christmas Eve, he confesses his love to her; she does not initially reciprocate. Later narrative developments in the original novels suggest they eventually begin dating.

In non-canonical or spin-off appearances like *Shakugan no Shana-tan*, he features in comedic or secondary roles. His central relationships endure: his deep childhood friendship with Yūji, including regular home visits, and his supportive yet complicated dynamic with Kazumi.