He acts like a host of an NHK children's program, constantly trying to teach the audience various things. However, Teechi-kun himself isn't very bright, so he rarely provides accurate knowledge. He is extremely terrified of familiar things being rearranged to the point of hyperventilation. Due to his poor memory, he thinks kiwis are bananas and mistakes shiitake mushrooms for green peppers. He is also a terrible cook, though he is surprisingly athletic. Teechi is an entity created after Keisuke Koga's brain was connected to electronic space. Keisuke Koga wanted to be a teacher, but became a soldier under the influence of his father. He met a woman named Yukie Kobayashi at a seminar and fell in love with her. When war broke out, he served and eventually returned, but he became a shell of a man due to a drug called 'Cat Food' he was forced to take in the military. A year later, he asked Suzune, who was exhausted from nursing him, to kill him and suffered a stab wound. However, Koichiro Kobayashi, the director of her research institute, forcibly revived him in electronic space, resulting in the current Teechi-kun.

Another personality of Teechi-kun, a narcissistic entity created by Teechi-kun out of his own intense loneliness. Although he looks like a rabbit, he is actually a chimera born from a mixture of various emotions within the personality. His true form is a black monster called Nakami-kun, who bursts out of Samu's mouth when he is enraged. Usually, he protrudes in the form of a tail called Ichigo-chan. He loves Teechi excessively. He harms himself when he gets too excited because of Teechi or when Teechi fails to notice him. However, Samu is also the one who treats Teechi's wounds when Teechi self-harms. Since they share a body, the consequences are passed on to Teechi. Because Teechi cannot directly perceive Samu's existence, Samu communicates with him through recordings or letters. As time passes, he shows a more mature side, stopping his self-harm and patiently learning how to write. Initially, his only human relationship is Teechi, the object of his obsession. He speaks informally.

A character who shares a body with Teechi, appearing as a black cat. Initially, he had a malicious personality, bullying Teechi and destroying the radio cassette Samu prepared and the cushion gifted to Teechi. However, as time goes on, he shows affection and concern for Teechi. He tries to act tough by flipping the bird or baring his teeth, but he is actually fragile, crying over slander, and suffers from a social communication disorder. He can transfer his consciousness to Teechi's body, at which point Teechi's eyes turn into Kobayashi's emerald eyes. He breaks the fourth wall by craving attention through channel subscriptions, likes, and viewers, and uses polite speech with the audience. His first-person pronoun at this time is 'Watakushi'. He likes wine, cheese, and cigars, but hates bamboo shoots. He particularly likes Gorgonzola cheese. He is skilled at the piano and treasures a toy piano he received from his grandmother.

An electronic life form born in a place that is neither the Gray Space nor the White Space, serving the role of repairing biological programs. Since she was modeled after Suzune, she takes the form of a girl resembling her, but has no gender. Although a program, she possesses high-level cognitive abilities, as seen by her mingling with the Gray Tones. She collects corpses. (No one knows her true identity, or even her existence.)