Chouca is a wandering, solitary figure in the world of Tanoshii Moomin Ikka, whose life is defined by a deep and abiding connection to the natural world. His existence follows a reliable seasonal rhythm; he migrates south each winter and returns to Moominvalley every spring, with his arrival serving as a welcome signal that the cold season has ended. In appearance, he is humanoid and typically wears an old green hat with a wide brim that often shadows his face, paired with a long green coat. He carries a backpack containing his few belongings and is seldom seen without his pipe or his harmonica, an instrument he plays frequently.

Chouca possesses an introspective and fiercely independent personality. Above all else, he values quiet contemplation, personal freedom, and the solitude he finds in the wilderness and on the open road. This profound need for autonomy means he can sometimes disappear without warning, particularly when he feels overwhelmed by crowds or rigid social structures. Despite his love for isolation, he is not unfriendly; his nature is inherently kind and gentle. His core motivation is to live authentically, true to himself and the natural rhythms of the world, while avoiding rules, fences, or anything that restricts freedom. While generally calm and patient, he can become uncharacteristically determined or upset when these values are threatened, such as by authoritarian figures like the Park Keeper or attempts to enclose open land.

In the story of Moominvalley, Chouca plays a calming and wise, though often peripheral, role. His most significant relationship is his deep, unspoken bond with Moomintroll. Their friendship is built on mutual understanding and respect, thriving in quiet companionship during shared activities like fishing trips, walks, and simply observing life in the valley. Chouca’s background beyond his established pattern of seasonal migration is largely unexplored. This sense of mystery contributes to his character. His personal development centers on learning to balance his inherent need for solitude with his genuine affection for his friends. He gradually comes to understand the worry his sudden departures cause, particularly for Moomintroll, and learns to offer subtle reassurance that he will eventually return, maturing in his ability to express his feelings within his quiet and reserved limits. His notable abilities are not magical or combative but lie in his wisdom and insight; he offers simple yet profound observations about life, nature, and self-truth. Furthermore, his presence and his music, played on his harmonica, often serve to soothe troubled moments or help resolve conflicts peacefully.