Miyoshi Hayashi attends an all-boys school, presenting an aloof and forthright demeanor. His frank, guileless personality commands attention through unconventional activities: counting every staircase in the school, photographing street signs, and drying sweet potatoes on the classroom balcony. He remains unapologetic about his true self amidst societal pressures for conformity.

To fund his interests, he occasionally assists at his parents' restaurant. This work supports a lifestyle centered on a personal motto valuing ample free time for seemingly trivial pursuits. His mysterious charm and carefree impulsiveness naturally draw in classmates and strangers, often prompting them to reflect on their own lives or discover new perspectives through their encounters with him.

Hayashi's enigmatic presence acts as a catalyst, sparking unexpected friendships and encouraging self-discovery among peers. His actions, appearing random or nonsensical to observers, stem from a philosophy of living authentically in the present moment.

One consistent aspect across adaptations is the subtle challenge in visually conveying his character, as his emotional expressions remain largely understated.