♂ m

At the research institute KOKON, he is in charge of the development of combat androids "EXTRAs", as well as being their guardian. Despite young age, he has a talent for genetic engineering that stands out among the researchers. He is an outwardly bright and intellectual person, but harbors various... read more

At the research institute KOKON, he is in charge of the development of combat androids "EXTRAs", as well as being their guardian. Despite young age, he has a talent for genetic engineering that stands out among the researchers. He is an outwardly bright and intellectual person, but harbors various doubts and internal conflicts. He tries to treat the three EXTRAs under his care like family.

♂ m

He used to be a researcher at KOKON, but left due to a disagreement with Graham. He is now an agent for the National Public Safety Commission, and is currently investigating KOKON's activities.

♀ f

Chika is one of the identical twin "EXTRA" androids which were created by Ellen. Both she and and her sister Chito do not have any human feelings, they are designed to be used only as cold-blood... read more

Chika is one of the identical twin "EXTRA" androids which were created by Ellen. Both she and and her sister Chito do not have any human feelings, they are designed to be used only as cold-blooded weapons. The two of them were created from Atsuko's genes. It seems that the only difference between the twins is their hairstyles. While Chika has two braids, Chito has only one.

♀ f

Chito is one of the identical twin "EXTRA" androids which were created by Ellen. Both she and and her sister Chika do not have any human feelings, they are designed to be used only as cold-blood... read more

Chito is one of the identical twin "EXTRA" androids which were created by Ellen. Both she and and her sister Chika do not have any human feelings, they are designed to be used only as cold-blooded weapons. The two of them were created from Atsuko's genes. It seems that the only difference between the twins is their hairstyles. While Chika has two braids, Chito has only one.

♂ m

He is an old man who is the founder of KOKON. While he is leading an organization that is willing to conduct inhumane research, he himself is a good person.

♀ f

She is the head of the mechanical development office at KOKON and in charge of developing weapons for EXTRAs. She is a weapons enthusiast and lover of beautiful girls, especially Touka, so she is unusually cooperative with Tsunakawa.

♀ f

A junior high school genius with an IQ of 200 who works as Takamiya's assistant.

♀ f

Head of the Intelligence Department of KOKON. She is an intelligent and motherly woman who has risen to the position of Graham's right-hand at a young age. She was once in a relationship with Tsunakawa, but they are now friends, perhaps because she hates to be restrained by others.

♀ f

She is in charge of another EXTRA development laboratory, that advocates a different approach from Tsunakawa's. She has a strong rivalry with Tsunakawa due to her high pride and different values.