Chouca wanders alone, deeply connected to nature. He travels constantly, migrating south each winter and returning to Moominvalley every spring. His arrival signals winter's end. Appearing humanoid, he wears an old green hat and a long coat of similar color, his face often hidden beneath the hat's brim. He carries a backpack holding his few possessions and is rarely without his pipe or his harmonica, which he plays frequently.

Introspective and fiercely independent, Chouca values quiet contemplation and freedom above all, finding comfort in the wilderness and the open road. This profound need for solitude sometimes leads him to vanish without warning, especially when crowds or rigid structure overwhelm him. Despite this, he possesses a kind and gentle nature. He shares a profound, unspoken bond with Moomintroll, built on mutual understanding and respect. Their central friendship thrives on quiet companionship during fishing trips, walks, and moments observing the valley.

He demonstrates wisdom beyond his years, offering simple yet insightful observations about life, nature, and the importance of being true to oneself. He dislikes rules, fences, and anything restricting natural freedom. Generally calm and patient, he can become uncharacteristically determined or upset when his core values of freedom and nature are threatened, like by the Park Keeper's rules or attempts to fence the valley.

His background remains largely unexplored beyond his established pattern of seasonal migration. His development involves navigating the balance between his inherent need for solitude and his deep connection to his friends in Moominvalley. He learns to understand the worry his sudden departures cause, particularly for Moomintroll, and occasionally offers subtle reassurance about his return. He matures in expressing his feelings within his quiet limits and plays a key, often calming role in resolving valley conflicts through his presence, music, or thoughtful actions.