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Surnames in breakets are just my own headcanon/theory on what their last name might be!
Koji Tanaka headcanons
-After every terrorist attack he felt guilty for all the innocent people they had to kill. After a while he started blaming the government like Sato, thinking "We wouldn't have to kill anyone if they didn't treat us Ajin so badly" and so on. However, deep inside he could never shake that feeling off, sometimes even having nightmares about the victims of their attacks torturing him. After such nightmares he always wondered how his team members could be so indifferent about it.
-After Sato saved had him, he told Tanaka that his parents had died during the ten years he was in the laboratory in order to strengthen his dependency on him (and his hate against humans, I guess). When Tanaka stopped trusting Sato, he realized that this could just as well be another lie and he secretly hopes to see his parents again one day. (I think they are still alive and will be happy to see their son again after all those years.)
-He loved music and art as a kid and dreamed of becoming a musician.
-He loves cats. His family always had at least one cat and it was hard for him to leave it behind when they had to run away.
-He's bi and still in the process on figuring it out. (This one is by Clover and I totally agree with it! :D)
Izumi Shimomura headcanons
-She loves poetry and wrote some poems for her former boyfriend, Kazuki.
-Sometimes she lets Kuro-chan out just to cuddle with it.
-She secretly loves to wear dresses.
-She'll be a close friend of Tanaka after Sato is defeated.
Kei Nagai headcanons
-He's gay, but would never tell his mom about it.
-He has romantic feelings for Kai.
-The more time he spends with Kou the more he likes him. However, he'd never admit that.
Kaito (Nekosawa) headcanons
-His father is Mr. Nekosawa (the guy who sold weapons to Sato) and Kai dyed his hair to set himself apart from his father.
-He loved stuffed animals as a kid and his father always told him he was not "manly" enough.
-Almost everyone had some kind of prejudice against Kai because of his family (including Kei's mother). He's been very lonely because of that. :(
Kou Nakano headcanons
-He's a Pokémon fan and collects Pokémon cards.
-He's pansexual.
-He has diagnosed ADHD. (This one's by Chibs on Twitter and I totally agree with it!) That's is one of the reasons why he has such a low self-esteem. :(
Takeshi Kotobuki headcanons
-He secretly has a crush on Kai but tries to repress his feelings for him.
-He died for the first time because his "friends" killed him after the police found out about the gang he was part of because of a mistake that younger Takeshi made. They were afraid that he would tell the police about the other gang members when he was caught, so they got rid of him by stabbing him in the chest... :(
-He LOVES birds and always feeds the birds in prison.
-He sometimes has nightmares of the moment he was stabbed.
Masumi Okuyama headcanons
-He grew up in an orphanage and noone knows who his parents are.
-His first death was after he fell down a staircase after staying awake and programming/hacking for three days straight. He ran out of food and water (probably the only moments when he ever left the house), but stumbled and fell because of the sleep deprivation.
Takahashi & Gen headcanons
-They had abusive parents which is the reason why they started taking drugs.
-Takahashi was the one getting the drugs. He was very protective of Gen.
-Takahashi died from a drug overdose and when he found out about his IBM he used it for pickpocketing in order to get money for drugs.
-When Takahashi saw his IBM for the first time, Gen thought he was on LSD.
Naomi Li headcanons
-She'll be an "Ajin rights activist" fighting the hostility against Ajin after Sato is defeated.
-Tanaka and her will be a couple.
Jun Suzuki & Jim (Pinkman) headcanons
-The Ajin in Maryland are like a huge family and Jun secretly has a crush on Jim.
-Jun is bisexual.
-She's very excited whenever a new Ajin comes to the facility.
Shinya Nakamura headcanons
-He's now living somewhere in Russia and has a dog called "Yuusuke".
-He thinks about his friend every night.
-He still thinks he was the only Ajin able to produce a flood phenomenon.