Paralyzing Scream. (Recharge 5-6) The ajin unleashes a scream that seizes the nervous system. Each creature within 20 feet of the ajin must make a DC 15 Constitution saving throw. On a failure, a creature is paralyzed for 1 minute. A creature can repeat this saving throw at the start of each of its turns, ending the effect on a success.
An ajin is a creature that cannot be seen or heard by all creatures and humanoids except those that own one. Some some ajin simply do whatever they want, while other owners are able to command their ajin properly and can share their ajin's field of vision and command it to attack targets. Some ajin are reckless and attack anyone in their immediate vicinity.
Ajin also seem to have a will of their own and are shown to be quite intelligent. Ajin often mimic the 'core' personality of their owner. Ajin can also mimic their owner's speech. However, there are also cases where ajin are left to their own will due to their host's negligence to control them or failure to do so. One case included a farmer that left their ajin to its own will, and it eventually taught itself things such as farming. If left alone for too long, it will be much harder to control them.
When two ajin's heads make contact, the memories of the owners that own them also 'collide', resulting in a brief moment where their respective hosts are able to see a memory from the other owner. During this collision, they also trade their mental states such as fear.
Tosaki's assistant and sort of bodyguard, who is an Ajin.
- Action Girl: Not only is she adept at using her IBM, she fights Tanaka's bare-handed and forces it back despite grievous injuries.
- Adaptational Wimp: She fares poorly in her first fight against Tanaka's IBM in Eriko's hospital room in the live action movie adaptation, where Tanaka had her on the ropes the entire time. In both the manga and anime, she easily turns the tide of the fight in her favor shortly after reviving and quickly recovering from Tanaka's surprise attack, forcing him to retreat after accomplishing his objective of obtaining Eriko.
- Affectionate Nickname: She named her black ghost "Kuro-Chan."(Japanese for black).
- Badass Adorable: She can be a total dork outside her serious demeanor and employer's shadow. Her interaction with Eriko is a crowning example of this. She also fights with her IBM for the first time against Tanaka's and wins. And that was after she had just respawned from being lifted up and Impaled with Extreme Prejudice.
- A Day in the Limelight: Chapter 27 expands on her backstory.
- Dark and Troubled Past: Her life before becoming Tosaki's assistant was not easy. Her father died in an accident while she was in high school. She had a shaky relationship with her mother, due to the latter insisting on keeping a useless, money-sucking boyfriend around, and her own boyfriend was cheating on her with one of her friends. When Izumi's stepfather tries to sexually assault her, he accidentally kills her, finding out upon Izumi's resuscitation that she's an Ajin, and decides to use her to get money. Witnessing her mother's silence over this, Izumi runs away from home. Later she finds out that her mother killed her stepfather to stop him from outing her as an Ajin, but was also killed by him during their struggle. Living on the streets, she had to prostitute herself to survive, but eventually contracted an STD which was killing her slowly and painfully when Tosaki found her. He relieved her of the pain, then proceeded to blackmail her into working for him against her fellow ajin, and is still doing so.
- Endearingly Dorky: She accidentally slips out information regarding Black Ghosts, something only Ajins should know, while she was questioning Eriko. When she realizes her blunder, she blushes. Eriko then internally notes that she's a weird person.
- Good Is Not Nice: She shows zero hesitation when she guns down the Health Minister's guards when saving Tanaka. Justified, as she has pretty understandable reasons to resent them considering that she herself is an ajin.
- Hunter of His Own Kind: She's an Ajin, but works with Tosaki, allegedly so she can get to know her own kind better.
- Impaled with Extreme Prejudice: By Tanaka's Black Ghost. She gets better.
- Older Than They Look: Played for Laughs in the last chapter, as she's apparently only 3 years younger than Tanaka.
- Parental Abandonment: Both her parents are dead.
- Ship Tease: With Tanaka in the last chapter where the two of them move in together.
- The Smurfette Principle: Izumi's the only female in the main cast, except for Carly Myers in the anime.
- Starting a New Life: Her real name used to be Yoko Tainaka, but once she becomes Tosaki's assistant she takes on her father's last name and her mother's maiden name to do this.
- Two First Names: Inverted, both her first and last names are family names. That's because its an alias taken from her mother's maiden name and her real father's last name.
- Undying Loyalty: Ultimately, to Tosaki. Even after he confirms that he destroyed all her records that she's a Demi-human, she chooses to stick it out with him until the very end.
KuroShimomura's black ghost.
- Meaningful Name: Besides the implication of being the only black ghost whose ajin names it, "kuro" means "black".
- Tiny-Headed Behemoth: Kuro is the most physically imposing black ghost seen so far, but its head is little more than a fin-like nub.
A Japanese-American biophysicist professor abducted to work for Tosaki.
- Bunny-Ears Lawyer: He's quite the eccentric, but his knowledge on Ajin is second to none.
- Easily Forgiven: It takes all of a few hours to start getting chummy with the man who tortured him. Considering that he's later shown to be a diehard fatalist, it's likely that Ogura doesn't even see the point of getting angry at someone who, from his perspective, has zero agency over their own actions.
- The Fatalist: He's a strong believer in predestination, and according to his theories ajin are the only ones capable of determining the future for themselves. Though he does seem to question his beliefs somewhat when he ultimately survives.
- Feel No Pain: Played with. He certainly feels it, but he disregards it as only being physical pain.
- Fingore: Tosaki chops down two of his fingers to get him to talk. It doesn't work.
- Must Have Nicotine: He never ever stops smoking, and he completely ignores No Smoking signs. Even when he's captured, his bodyguard killed, and is being tortured and his fingers chopped, all wants is to get his pack of cigarettes back, and that's all it takes to get him to talk.
- Outliving One's Offspring: It's revealed in the series' climax that his son passed away years ago.
- Straw Nihilist: According to Ogura, ajins are the only reason that humanity has any value whatsoever, as they're the only ones who aren't subjected to absolute predestination. Though it's implied that he loosens up on this belief somewhat when his predictions of his own death turn out to be incorrect.
- Tempting Fate: In chapter 46, he notes that he's probably going to die once he finishes his Mild Seven cigarettes and in the series' climax, he's down to his last one. He survives.
- Tragic Keepsake: The discontinued Mild Seven cigarette brand, since his late son bought them for him on Father's Day.
High-ranked member of the Ministry of Health, Labour, and Welfare, assigned to supervise Tosaki and later to succeed him as the head of the Ajin Management Committee.
- Irony: At the start of Chapter 53, he calls Tosaki out on wearing gloves during his work, saying that Tosaki is still clinging to the past. That same chapter Tosaki kills Sokabe without gloves on after the latter threatens Izumi and tries to stop Tosaki from leaking the DHCC's secrets to the public.
- It's All About Me: In contrast to Tosaki, Sokabe doesn't give a damn about anything besides climbing up the government hierarchy.
- Jerkass: His job seems to be to constantly pester Tosaki regardless of what the situation is.
- Jerk With A Heart Of Jerk: The guy really has no ideals or beliefs outside of boosting his own position. The few times where it looks like he's pulling a Pet the Dog moment, it turns out to just be him acting in his own self-interest.
- Kick the Dog: While Sokabe's an all-around asshole, he really crosses the line when he threatens to notify the higher-ups that Shimomura is an ajin, which is what prompts Tosaki to kill him.
- Smug Smiler: As if his character design is not indicative of his Jerkass personality enough, his smirk rarely leaves his face.
A colonel of the Japan Self-Defense Forces and member of the Ajin Management Committee.
- The Watson: Given that Japan is pretty far behind the US when it comes to knowledge on ajin, Kouma's misconceptions on how IBMs work is what prompts Ogura to deliver some exposition on them.
Japanese Minister of Health, Labor and Welfare. Tosaki's superior.
- Dirty Coward: He kowtows to the (supposed) demands of Sato's group the moment his own life is threatened.
- Hate Sink: He's pretty much the series' stand-in for everything wrong with the Japanese government. He's a cowardly, self-important sleazeball who has no problem with putting captured ajins through heinous experiments for the sake of lining his own pockets.
- Karma Houdini Warranty: He's shot in the hand by Izumi and later has his career destroyed when Tosaki comes clean about the Ajin Management Committee's actions to the public.
- No Name Given: His name is rarely seen, as most of the time he is simply referred to by his title.
- Sleazy Politician: From his few actions that he made in the manga and the anime, he is most certainly not an honest and upstanding politician, engaging in dirty stuff with corporations and being obstructive with Tosaki's work.
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