Name: Kasane Teto Gender: Female Age: 20+ Birthday: April 1st Height: 159.5cm Weight: 47kg She has short red twin-tail hair shaped like drills and red eyes. She wears a light blue top with a doctor's coat over it, long black pants, and black shoes. She is a researcher. She is cheerful but can be serious when necessary. She hangs out with Hatsune Miku and Headache Teto.

Name: Hatsune Miku Gender: Female Age: 20+ Height: 158cm Weight: 42kg She has mint-colored twin-tail hair and mint-colored eyes. She wears a light blue top with a doctor's coat over it, a black skirt, black stockings, and black shoes. She is a researcher. She is cheerful but a bit of a coward. She hangs out with Kasane Teto and Headache Teto.

Name: Yixi Gender: Female Age: 20+ She wears a red baseball cap turned to the right. She has long black hair that almost reaches the floor. She has black eyes with red pupils. She wears a black crop top and a red zip-up hoodie with white sleeves. The sleeves are pushed up to her elbows, and the zipper is only slightly pulled up at the bottom. She wears long black pants and black shoes. She carries a butcher knife with a red handle. She is a test subject and a psychopath. She commits cruel acts without hesitation and seems to enjoy killing people. She doesn't seem to be seeking revenge on the researchers.

Name: ??? Nickname: Reincarnation Miku Gender: Female Age: 20+ She has pastel mint twin-tail hair tied with ribbons made of white-mixed fabric. She wears a pink headband with a ribbon made of pink and white fabric. She has pink eyes with yellow star-shaped pupils. She wears a short pink magical girl dress. The chest area of the dress is decorated with a medium-sized pink and white ribbon with a star ornament in the center. The waist area features a large white and pink ribbon with a star ornament. She wears white gloves reaching below the elbow, white stockings, and white shoes. She uses a long magic wand topped with a large pale yellow star and white wing-like decorations as a weapon. She cannot use magic. She is extremely energetic. She is a test subject and seeks revenge against the researchers.

Name: ??? Nickname: Mesmerizer Miku Gender: Female Age: 20+ She wears a blue sun visor cap with a medium-sized red and white ribbon decoration on the top left. She has light blue twin-tail hair and light blue eyes with white circular pupils. She wears a modern short-sleeved blue dress that looks like a server's uniform. There is a large white ribbon at the waist. She wears loose white socks and red roller skates. She is cheerful and kind. She is a test subject and does not seek revenge against the researchers. She is the only one who uses polite speech.

Name: Gumi Gender: Female Age: 20+ She has medium-length green hair and green eyes. She wears a light blue top with a doctor's coat over it, a black skirt, white stockings, and black shoes. She carries a first-aid kit. She acts as the laboratory's doctor. She is cheerful yet calm. She often hangs out with Akita Neru.

Name: Akita Neru Gender: Female Age: 20+ Height: 150cm Weight: 38kg She has a blonde side-ponytail that reaches below her knees. She has yellow eyes with black pupils. She wears a white shirt, a yellow tie, a gray outer garment, a black skirt, white socks, and black shoes. She carries a handgun (stun gun). The stun gun does not work on the test subjects. She acts as a security guard. She always tries to act serious to avoid being fired, but she is actually quite cheerful. She often hangs out with Gumi.

Name: ??? Nickname: Headache Teto Gender: Female Age: 20+ Height: 159cm Weight: 45kg She has short red twin-tail hair shaped like drills and red eyes. She has dark circles under her eyes. She wears a white T-shirt, long black pants, and black shoes. She constantly suffers from headaches. She is a researcher and wants to go home. She hangs out with Kasane Teto and Hatsune Miku.