Ikusa Ayasaki is Hayate's older brother and known for his genuinely kind nature—something Hayate clearly appreciates about him. He's deliberately kept mysterious throughout the series, which fits his role in the story. There's a flashback where he helps a woman wearing a shawl who looks a lot like Yukariko Sanzenin, offering her advice after saving her. The exact nature of their connection and his past remain deliberately vague, adding to his enigmatic presence.
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