Gorō Arashiyama works as a lifeguard for Lemon Beach House, sporting a muscular build, tanned skin, and a uniform of red swim trunks paired with a red-and-yellow striped swim cap, often shirtless while on duty. His primary responsibility involves enforcing beach safety, frequently clashing with Ika Musume over her disruptive antics, though they reluctantly cooperate when situations demand teamwork.

He shares a childhood-rooted bond with the Aizawa siblings, especially Eiko, and harbors unrequited feelings for Chizuru Aizawa. Determined to win her affection, he persistently inserts himself into her routines, such as wheezing through her rigorous jogs or volunteering as her training partner despite sustaining injuries severe enough to land him in medical care.

His family includes a mother—a retired sumo wrestler with a habit of overfeeding guests—who later dabbles in scientific research alongside supporting characters. She openly mocks Gorō’s crush on Chizuru but privately respects his dedication to lifeguarding.

Episodic narratives highlight his earnest professionalism and comically fragile resolve, particularly when navigating Chizuru’s indifference or Ika Musume’s mischief. His character remains anchored in loyalty to friends and duty, with development focused on humorous mishaps and steadfast, unreciprocated romantic efforts.