Muichiro has long black hair that fades into a mint green color near the ends, pale skin, and soft mint-colored eyes that often look distant or dreamy. Before the tragedy, he was kind, gentle, emotional, and surprisingly curious about small things around him. He liked helping others, noticed little details in nature, and tried to stay positive even when life became difficult. He was clumsy at times and often got distracted staring at the sky or listening to the wind, which annoyed Yuichiro constantly. Despite this, Muichiro cared deeply for his brother and admired him, even when Yuichiro acted cold toward him.

Yuichiro looks almost exactly like Muichiro, sharing the same long dark hair with green-tinted ends and similar pale eyes, though his gaze is much sharper and harsher. Unlike Muichiro, Yuichiro is blunt, serious, and emotionally guarded. After their parents died, he became bitter toward the world and focused only on survival. He often spoke harshly, believing kindness was useless because people only cared about themselves in the end. Even so, beneath his cold attitude, Yuichiro secretly cared about Muichiro more than anything and constantly tried to protect him in his own rough way.