I have a detailed backstory headcanon for Midori that I am considering turning into a fic. It's a bit graphic so here are the content warnings: medical malpractice, drug abuse, torture, self-harm.
Asunaro was never exactly safe and sane regarding their medical practices and tests. In October 1992, three women were artificially insemenated in order to test the effects that various drugs would have on the resulting children. Each woman was given different amounts of various opioids, Midori and his mother receiving the least. This drug use caused abnormal brain development in Midori. The other two women were unable to carry their baby to term and miscarried, but on June 15th, 1993, Sou Hiyori was born.
Sou was born intersex, he has Klinefelter syndrome. Asunaro took this as an opportunity to further abuse him medically. With a damaged ventromedial prefrontal cortex, Sou experienced less empathy than most people in his childhood. Due to the number of drugs involved in his development, he was an addict at birth. He was very dependent on Asunaro, as they would supply him with the drugs he needed. Throughout his childhood, he was Asunaro's guinea pig for drug experiments. He did not verbalize until age 4 when he began speaking in full sentences whenever he chose to. he was extremely intelligent, a prodigy. During withdrawals, he would regress and act like a fussy toddler, as opposed to his usual quiet, calm, acute demeanor.
The older Sou grew, the tests ran on him became crueler and crueler, and his behavior became more reckless. Starting at age 13, Asunaro would place Sou into a "break room" if he misbehaved. This room was really just solitary confinement until he would exhaust himself to the point of passing out or get his act together and obey. Sometimes he would be put into this room for a few days without his medication and Asunaro would observe the withdrawal symptoms. These symptoms consisted of paranoia, pain, sweating, migraines, and would even bring Sou to tears. During these withdrawal days, Sou developed an intense fear of death due to horrific hallucinations. Although he doesn't have a very strong memory of this time, his PTSD was triggered when he lost Russian roulette.
During his teenage years, he began self-harming to ease the boredom that comes with a lack of a full set of emotions. He tested his pain limits out of curiosity, biting and cutting himself frequently. He didn't really take care of his appearance much, his hair grew out long and he had dark eye circles due to insomnia. When he wasn't being punished, he was subjected to various intelligence and social tests. He was highly skilled in mirroring, pattern recognition, manipulation, and calculating outcome chances. He became fascinated by the human psyche and learned how to appeal to people to get whatever he desired. Sou was allowed to go out in public by himself at age 16 when he was fully obedient and trained for Asunaro. Sou loved being able to interact with real people who weren't just using him for tests. He decided that he wanted to be more than a test subject, he wanted to have the power that was used against him all his life.
When Sou turned 18, the death game plans were introduced to him and he was given his assignment to collect consent form signatures. Asunaro offered him more power if he would allow them to modify his body and turn part of him into a doll. He enthusiastically agreed and slowly gave up the majority of his human parts over the course of six years. Sou learned how to manufacture AIs quickly as Gashu's apprentice. He was a major influence on the development of the participant AIs. He began developing Maple, an AI based upon a girl who had a crush on Sou while he spent his time gaining the trust of the death game participants. He took elements from that girl and twisted them into a sad, naive doll who was torn between her command to kill Sou and her feelings for him.
By age 23, Sou's human body had been reduced to a torso with many organs removed or replaced. His dissected remains were preserved for other freakish experiments performed during the death game. He planned to get some form of sick revenge on the people who put him through his hellish upbringing after the death game, but to his dismay, was killed before he had the chance.
If anyone has any questions about extra details, please reply with them, and I will answer! I have a lot of headcanons for him :)
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