Rin Araya, a 19-year-old university student and one of four central protagonists, balances academic life as a second-year student with aspirations of professional comedy. Her striking appearance features light green hair in waist-length twin ponytails, olive eyes, and a petite frame at 1.44 meters tall and 38 kilograms, with measurements of 77-53-77. She dresses in a vibrant ensemble: a yellow jacket with white sleeves and red cuffs edged in thin white lines, a white shirt bearing a red heart and "AR" text, a sky-blue short skirt, black socks, and green sneakers.

As the straight man in the comedy duo RDeco, formed with Nayuta Asōgi during middle school, Rin counters Nayuta’s absurdity with sharp logic and physical retorts, often punctuating jokes with playful hits. Their partnership extends beyond the stage to part-time work at an eel restaurant, shared with friends. Rin’s analytical mind drives her to vocalize opinions candidly, refining her comedic timing and delivery with precision.

Though her long-term personal growth remains unexplored in additional media, the narrative underscores her gradual skill development through collaboration. Curt and direct in communication, she prioritizes rationality in both daily interactions and comedic craft, relentlessly pursuing the duo’s goal to perform at Osaka’s Nanba Grand Kagetsu Hall. Her dedication intertwines with group efforts, emphasizing teamwork as the cornerstone of their artistic evolution.