Miyuki Washiu acts as homeroom teacher for Hiroshi Kuzumi's class, radiating consistent energy and cheer with an almost permanent wide grin. His enthusiastic teaching style pushes students to embrace lessons with matching passion. While his official academic subjects remain unspecified, his visibly athletic physique and classroom attire—invariably sportswear with a towel draped over his shoulders, likely for sweat—strongly imply a physical education role. He favors informal, approachable methods over strict authority, occasionally weaving humor into interactions to position himself as a companionable peer rather than a traditional educator. Notably, he bears the distinctly feminine given name "Miyuki," an uncommon choice for a male character, though its origin stays unexplained.