Eikichi Hibino is a human male with brown hair, brown eyes, and a height of 180 centimeters. As the grandfather of Matsuri Hibino, father of Iwau Hibino, and father-in-law of Michihito Hibino, his familial ties anchor him within the core dynamics surrounding the protagonist. His name, "Hibino," blends the kanji for "sunshine" (陽), "contest" (比), and "field" (野), while "Eikichi" merges "England" (英) and "good luck" (吉). He first appears in the series’ debut episode, though his narrative contributions beyond this introduction remain undefined.