Kidou is an exterminator that lives in Trade City E-05 in Soutwest Asia on the borders of the Extreme East. His profession forces him to live a life of danger, and he is extremely efficient at killing Cagasters. He is a 17 year-old male with black hair and dark blue eyes.

Kidou is extremely guarded and puts on a cold demeanor. He has trouble handling things that remind him of himself when he was younger. He behaves like he has no empathy, but that may not be the case, rather he is actively resisting the feeling of empathy to protect himself.

He believes that he should never hesitate to kill a cagaster, even if they still appear human. He was taught this at a young age.

He tries not to care about others because death can come to anyone at any moment, but he still wants to protect them.

He has dark spiky hair that gets in his face. He is very fit, bulky enough to wield a gun without any kick, but still relatively lean. He also has a scar on his jaw.

He is known to be ruggedly handsome with a poor attitude.

He usually is in dark t-shirts, tank-tops and cargo pants with knee pads.