|"There are nineteen types of penguins, but only two live at the South Pole"|
|Debut Episode||Season One, Episode 1|
Yuu is one of the human friends of Rin, Len and Miho. She is normally reserved and calm unlike most of the people around her. She normally hangs out alongside The Animal Whose Name Must Not Be Spoken as a companion of hers.
Yuu is the most calm of the group, but can easily be drawn into the chaos around her. She is the most friendly of the group as well, even among her companion. She is known for saying rather useless trivia around her circle.