Like a host of an NHK children's program, he tries to teach the viewers various things. However, Teach-kun himself is not that smart, so he rarely imparts correct knowledge. He is extremely terrified to the point of shortness of breath when familiar things are rearranged, and due to his poor memory, he thinks kiwis are bananas and mistakes shiitake mushrooms for bell peppers. He is also a terrible cook. Surprisingly, he has very good athletic nerves. He has a very kind personality toward his other personas, but occasionally shows a cold side. While Kobayashi has become somewhat kinder or weaker over time, Teach has increasingly shown a side that makes sharp remarks, talks back to Kobayashi, or goes at his own pace. His favorite food is kiwi and his least favorite is shiitake mushrooms. He calls kiwis bananas and shiitake mushrooms bell peppers. He is basically a cat. 27 years old. Male.

He tries to act tough by raising his middle finger or baring his teeth fiercely, but in reality, he has a fragile personality, such as crying due to slander and libel. He likes wine, cheese, and cigars, and hates bamboo shoots. He seems to especially like Gorgonzola cheese. He is skilled at the piano and cherishes a toy piano he received from his grandmother. In the beginning, he had a villainous personality, bullying Teach or breaking the radio cassette player Samu prepared and the cushion gifted to Teach, but as time goes on, he shows affection for Teach and worries about him. He considers himself handsome. He is also a cat. 34 years old. Male.