Male. Depicted as a blue cat. He isn't very smart, so he rarely provides accurate information. He is extremely fearful to the point of hyperventilation when familiar things are rearranged. 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 excellent athletic reflexes. While he is timid and very kind to his other personalities, he occasionally shows a cold side. While Kobayashi has become kinder or more fragile over time, Teach has increasingly shown a side that makes sharp remarks, talks back, or acts at his own pace.

Male. Depicted as a blue rabbit. He loves Teach to an excessive degree. He becomes overly excited because of Teach, or harms himself when Teach fails to notice him. Compared to the beginning, he stops self-harming in the later stages and shows a more mature side, such as patiently learning how to write. He absolutely loathes Kobayashi.

Male. Takes the form of a black cat. In the beginning, he had a malicious personality, bullying Teach and destroying the radio cassette Samu prepared and the cushion gifted to Teach. However, as time passes, he shows affection and concern for Teach. He acts tough by flipping the bird or baring his teeth fiercely, but in reality, he is fragile enough to cry over slander and suffers from social communication disorder. He likes wine, cheese, and cigars, but hates bamboo shoots. He reportedly especially loves Gorgonzola cheese.

Female. She is shown to be close to Samu, even teaching him how to write. Uniquely, like Samu, she can travel between the Gray Space and the White Space. Her pure white fur is said to have a velvet-like texture.

Male. He badmouths Teach-kun, Samu-kun, and Kobayashi, and sometimes comes down to talk to them directly. After losing an eye in an attack by Teach, he shows a fear of him. Despite this, he persistently continues to take over the channel or get on the nerves of other characters. His characteristic modulated voice is almost impossible to understand. He is said to be the tallest.

Female. A member of the Gray Group residing in the Gray World, she shouts the line "Ori-chan has arrived!" every time she appears. She is always high-tension and maintains a cheerful attitude about everything. Her original colors are a yellow body with red horns.

Male. A member of the Gray Group residing in the Gray World who crawls on all fours and communicates with the sound "Ah-." Although it only sounds like "Ah-," Samu-kun and other members of the Gray Group seem to understand him. With an IQ over 500, he is the smartest character in the story. His original body color is orange.

Uses scissors to primarily kill Teach, Kobayashi, and Dada. It is said that Dada rescued Oonishi from the Bug Space in the past. Kobayashi fears Oonishi for constantly killing him, but Teach is seen greeting Oonishi nonchalantly. Although Samu has never met Oonishi directly, he harbors ill will toward Oonishi for repeatedly killing Teach.