William appears to be a mild-mannered young boy, characterized by his thin frame, sandy hair, and eyeglasses that resemble his father's. His tendency to remain quiet often gives the impression that he is easygoing and compliant. However, beneath this calm exterior lies a determined nature that emerges when he encounters something that piques his interest.

When curiosity strikes, William transforms into a remarkably stubborn individual, displaying a tenacity comparable to that of a bear pursuing honey. This unexpected trait highlights his strong will and relentless pursuit of knowledge, suggesting that he is not as passive as he may initially seem.