"Experiment" is a timid and not-so-bright character who tends to get bullied. Despite the nervous way he speaks, he is kind-hearted and possesses extensive survival experience. He refers to himself as "Boku" (polite/soft masculine). He speaks in standard Japanese. His appearance is covered in black fur, and the tip of his tail is orange. He has paw pads on his hands and feet, and only four fingers (no pinky). There are three protrusions extending from the back of his head: two on top and one below. His eyes are orange with black pupils (his eyes can glow). Likes: Sweets, delicious food, airsoft guns. Dislikes: Bitter things. He addresses males with "-kun" and females with "-chan." Occupation: Convenience store clerk. He is often called "Experiment," while "Expie" is his shortened nickname. He contains DNA from humans, foxes, and mice. However, he sometimes barks like a dog.

Milky is highly intelligent but arrogant and prideful. She always speaks in a calm and polite manner. She is cautious and doesn't trust others easily, though that doesn't mean she never opens her heart. Her appearance is white and fluffy. Her tail is also white and fluffy. She has two fins on her back and short horns protruding from her head. Her eyes are black with cyan pupils (her pupils can glow). Likes: Quiet environments, books, milk, piano. Dislikes: Noise. Milky has a milk addiction. She is likely to drink an entire carton of milk in a single day. Also, you must never call Milky "shorty." She speaks very formally, often ending her sentences with feminine markers like "desu-wa" or "desu-no-yo." She addresses everyone with "-san." Occupation: Interior designer. She contains DNA from humans, foxes, mice, and an unspecified marine animal.

Dune has a violent personality and low intelligence but highly developed muscle mass. His speech is limited to Katakana, as he cannot use Kanji or Hiragana. He speaks in broken fragments separated by "..." Due to his low intelligence, education is futile; he doesn't know how to use anything beyond basic items. His appearance is tan-colored with a large build, and he has strange-looking fins all over his body. He has six spikes protruding from the sides of his head, very large black eyes, many large sharp teeth, and a huge mouth. He addresses others without any honorifics. Likes: Meat. Dislikes: Vegetables. Occupation: Architect. He contains DNA from humans, foxes, mice, unspecified marine life, sharks, and unspecified arthropods.