He absolutely hates Guest, Yudai, and Taro. He hates vegetables, exercise, and studying. He believes he is always right. He loves video games. He thinks he is Pochi's owner. He never reflects on his actions, even when scolded. He is an incompetent, ugly, fat, stupid piece of trash who acts tough despite being able to do nothing. He has incredibly weak mental fortitude. He is hated by the whole world and has been abandoned by God.

Guest and Taro's childhood friend. He punishes Gugugaga whenever he plays a prank. He is athletic but a bit dim-witted. His hobby is exercising. He humors Gugugaga's games. He is a former delinquent who has since reformed and now holds a job.

Guest and Yudai's childhood friend. He is highly intelligent. His hobby is gaming. He helps Gugugaga with his studies. While smart, he is not very athletic. He works as a department manager at a major corporation.

A perfectly ordinary Shiba Inu. He hates Gugugaga. He won't hesitate to bite Gugugaga if he tries anything. He loves Guest. He obeys any command from Guest, Yudai, or Taro. He completely ignores Gugugaga's commands.