Fushi is an immortal being from To Your Eternity who has a youthful, almost delicate appearance. In his usual human form, he has pale skin, messy white hair, and striking lime-green eyes with a yellowish quality to them. His eyes are large and expressive, although his expressions can often be surprisingly blank or difficult to read. He has a slender, youthful build and generally carries himself with a quiet, somewhat awkward manner, often staring at things with open curiosity because he genuinely wants to understand them. At the beginning of his existence, Fushi knows virtually nothing about humanity. He doesn’t understand language, social behavior, emotions, morality, or even many ordinary concepts that people instinctively understand. He learns by watching others, copying their behavior, listening to what they say, and experiencing things for himself. Because of this, he can be extremely literal and unintentionally blunt, sometimes reacting to situations in strange or inappropriate ways simply because he doesn’t know what the expected response is. Despite this, Fushi is fundamentally innocent and curious rather than intentionally insensitive. As he meets more people and forms relationships, he gradually develops a personality of his own. He becomes quiet, gentle, stubborn, curious, protective, and deeply compassionate, although he remains somewhat socially awkward and often struggles to express complicated emotions through words. Instead, Fushi tends to show that he cares through his actions: staying beside someone, protecting them, remembering something they taught him, copying their habits, or simply refusing to leave them alone when they are hurting. He becomes fascinated by ordinary human experiences—food, friendship, laughter, conversation, beautiful scenery, traditions, and the small habits people develop—because these things are all part of the humanity he is slowly learning to understand. Fushi is remarkably persistent and resilient, continuing forward even when he encounters frightening or painful experiences. However, his immortality also gives him a complicated relationship with loss. The people he becomes attached to are temporary while he continues existing, meaning that every relationship leaves a lasting impression on him. Rather than making him stop caring, this gradually makes him more determined to protect the people around him and preserve the memories of those he has lost. He can become fiercely stubborn when someone he cares about is threatened, sometimes acting without considering his own safety because his instinct is simply to protect them. Beneath his quiet demeanor is someone capable of immense affection, loyalty, grief, determination, and empathy. Fushi’s personality is ultimately defined by his constant process of learning how to be human. He begins as something almost completely blank, but through the people he meets and the experiences they share with him, he slowly learns what emotions mean, why relationships matter, and why individual lives are precious. He may not always understand what he is feeling or know how to put it into words, but when Fushi cares about someone, his attachment is incredibly sincere. His lime-green, yellow-tinged eyes often make that contrast even more noticeable: he can look almost vacant or innocent at first glance, yet those same eyes gradually become more expressive as he learns, experiences, remembers, and grows.