Having grown up alone in the wild, Gau has little concept of civilized society and behavior. He mostly communicates in animalist howls and growls, or uses short sentence fragments with improper grammar, including referring to himself in the third person. He is not to be thought of as stupid, however: he is capable of understanding complex concepts such as love, friendship, grief, and gratitude. He quickly bonds with Cyan and Sabin when they feed him, and even though Sabin dislikes him, Gau jokes around with him seemingly oblivious of his distaste.