Common Raccoon, also called Arai-san, bursts with impulsive energy, often acting before thinking yet showing fierce determination to achieve her goals. Her appearance features silver-gray hair fading to white, with black front sections including a white stripe and a central white bang patch, complemented by warm brown eyes. Rounded raccoon ears and a distinctive ringed tail mark her species. She wears a lavender shirt with puffed sleeves, a white fur collar, and a black bow tie, paired with black and white gradient gloves. Her outfit includes a black miniskirt, gray leggings fading to white, short black socks, and black loafers.

A pivotal event during a sandstar eruption shaped her background: chasing a park guide's hat blown into the savanna, she fell off a cliff when the hat was struck by concentrated sandstar. Waking to find the hat gone except for a single red feather, she used it to speak with a Lucky Beast who hinted at a secret mountain treasure. This loss drove her pursuit of the hat thief, following tracks left by others.

Fennec Fox consistently accompanies her journey, offering support and information. Her quest to find the thief motivates many actions, fueling a growing sense of justice to protect Japari Park. Crossing a river via a bridge built by Kaban, she declared a life-debt, showcasing her respect for heroism. She eventually confronted Kaban, believing her the thief, and recovered the hat after a struggle. Learning of Kaban's reputation and hearing Fennec's explanation, she apologized and returned it.

She aided in locating and aligning the Four Gods Tablets to activate a sandstar filter, later joining a large group of Friends to immobilize a giant threat and rescue Kaban. Her development shifted from single-minded pursuit to collaboration for the park's safety. She helped repair the Japari Bus and joined an expedition for parts.

In the spin-off manga "Kemono Friends: Welcome to Japari Park," she wrestled with being seen as "common," seeking to redefine herself. Studying other Friends at a caretaker's suggestion, she ultimately embraced her true nature. She ran for tourism ambassador against Peafowl to elevate her status, though she lost the election. Her speech often ends with "nano da."

Appearing in a minor role during snowy conditions at the Lodge in the second season, her central relationship with Fennec endures, defined by mutual reliance and admiration. A notable paradox is her pursuit of a thief despite her species' stereotypical association with thievery. Her admiration for Kaban grew as she witnessed Kaban's deeds and heard other Friends' accounts.

She retains her impulsive nature, charging headlong toward objectives without full information, but demonstrates capacity for reflection and growth, especially in reconciling misunderstandings and aiding collective efforts for the park's wellbeing. Her background arc concluded when she shared the full story of her hat pursuit during a celebration.