Koduck is a duck-like water type Pokémon that appears as a supporting character in the story. It serves as the constant companion of Lucy Stevens, a young journalist investigating the main mystery. The character is defined by a perpetually anxious and neurotic disposition, frequently holding its head in its hands or standing vacantly while trying to soothe its chronic headaches. This physical and behavioral trait is central to its portrayal. Its main motivation is managing this persistent pain, and its actions are often driven by a desire to avoid stress and remain calm. However, when its headache grows too severe, usually from extreme stress or danger, involuntary psychic powers emerge, unleashing powerful shockwaves that can affect the surroundings. This ability becomes a notable element in the investigation. Koduck relies heavily on Lucy for comfort and guidance, and it forms a friendly bond with the partner Pikachu, who on one occasion even tries to massage its feet to relieve tension. Throughout the events, Lucy adjusts her handling to minimize Koduck’s stress, and its unexpected psychic bursts prove both a challenge and an asset in critical moments. The character does not undergo a dramatic transformation but remains an anxious yet loyal partner whose hidden strength surfaces when needed.