Warning!! The examples below may include spoilers for the manga, as well as the anime. Both storylines started widely differing around the appearance of Kanone (episode 18/volume 5).
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Ayumu Narumi"The melody of logic will always play out the truth."A sixteen year old apathetic high-schooler and the reluctant hero and designated Savior of the Blade Children. He is looking for his older brother Kiyotaka, who disappeared two years ago. He lives with his sister-in-law Madoka and apparently is in charge of all the cooking (and an excellent cook) ; he is often shown thinking about what to make for dinner. His main weapon is his brains, preferring to resolve conflict through reasoning than violence... and he is startlingly good at it; however, his huge self-deprecation issues severely impede him.
Hiyono Yuizaki"Love is something that doesn't seek anything in return."The 17 year old president (and only member) of the Newspaper Club at Tsukiomi High who instates herself as Ayumu's sidekick after helping him resolve a murder case (in the anime, just an attempt) in their school. Though not an Action Girl and far from being on equal grounds with Ayumu or the Blade Children's intelligence, she is still precious help to Ayumu as an informant - she is absurdly good at gathering information; though she claims regular school gossip is her primary source, she also blackmails Wataya for information on police cases, and is in fact rumored to have blackmail material on everyone. More importantly, she has unconditional trust in Ayumu's abilities and knows his weakness is his own self-confidence; she will thus go to great lengths to push him to fulfill his potential. Not that that'll stop him from declaring her annoying. She often declares her love for Ayumu in grandiloquent ways, though as it tends to be related to his delicious cooking, it's hard to know just how serious she is about it. Alternately, she routinely calls Ayumu cruel and heartless and, in the anime, punches him with animal puppets (also tends to be related to his cooking). It's later revealed that she is in fact, not actually a 17 year old high school student, and was hired by Kiyotaka to play the role of 'Hiyono Yuizaki', a character whom he fabricated for the sake of getting close to and manipulating Ayumu in hopes that when he eventually finds out that this girl who seemingly supported him through everything turns out to not be real, his resolve will break and he'll kill Kiyotaka. Despite this, she grows to care about Ayumu.
Madoka Narumi"People sure rely on my little brother a lot."Kiyotaka's wife; they had been married for a year when he disappeared, which felt like abandonment and hit her very badly. She is however a very strong woman. A police detective, they met while she worked under him (which apparently consisted mainly of kicking him and forcing him out of various ridiculous costumes). Ayumu does everything he can to keep her uninvolved in his trouble with the Blade Children, but they've caught on, and more importantly, she'll have none of it. She tries to do the same and keep him out of her own police cases, even when they're related to the Blade Children and he tries to nose his way in.
Eyes Rutherford"Kiyotaka... Is this the result... of my belief ?"A world-renowned pianist and child prodigy, the youngest of the Blade Children seems to have assumed a leader position amongst the main group. He angsts a lot yet is practically devoid of emotion. This is because, in order to bear the weight of the curse, he decided at a young age to freeze his heart and become "a demon without blood or tears". At the beginning, he strongly believes Kiyotaka's words but doubts Ayumu's power; however he is arguably the most idealistic and hopeful one of the Blade Children. He is not as directly violent as his fellow Blade Children (probably because of the trouble this would bring him due to his super-star status) but does not hesitate to order Kousuke or Rio to murder people, and will get in the action when required to in the manga.His mother died when he was young, possibly in a car crash. Kanone is his childhood best friend and Eyes wishes to save him, or at least stop him without killing him. Ryouko resents him for being the reason Kousuke became a killer, but still sympathizes about the whole Kanone deal.
Kousuke Asazuki"I forgot to tell you but... while I may not lie, I don't keep promises."One of the most violent of the Blade Children, he is utterly convinced that the Blade Children have no hope and actively tried to kill Ayumu during his "test". Yet he'll let the others believe what they want (and eventually joins them in Ayumu's fanclub anyway). He transfers into Tsukiomi High after it's been established the Blade Children are not going to try to gut Ayumu quite so much anymore.He is one of the most important protagonists of the prequel, Spiral: Alive.According to Hiyono's research, his mother died when he was three and he has no other living relative. He was taught to fight by Kanone in England. He seems slightly scared of Rio, who calls him an idiot, but they have a sort of squabbling-siblings dynamic. He'll deny it, but he has a long history of Will They or Won't They? with Ryouko, the biggest issue being their curse and, in the manga, the fact that they're half-siblings. It's never clear whether they know of their own and the other's feelings, but the fact is that they're shown to live together once he transfers and Ryouko is introduced.
Rio Takeuchi"Please trust in your own power, Narumi-otouto..."Rio looks like a sweet, cute little girl, and plays it for all it's worth; she is actually one of the most violent and sliest of the main group. She is also a student at Tsukiomi, and an explosives expert. She tends to be very extreme in everything she does: she believes in her own strength fully and doesn't not hesitate to put her life on the line... or Ayumu's, but once he has convinced her, she trusts and relies on him completely.She lives alone in an apartment; nothing is mentioned of her family, but she is clearly quite able to take care of herself. She adores Kiyotaka, who seems to act like her uncle and spoil her a lot, and is hinted to have a crush on Eyes and/or Ayumu.
Ryouko TakamachiKousuke's childhood
Kanone Hilbert"I'll tell you something useful. The overwhelming power of violence beats logic any day."Cheerful, polite, charismatic, good-looking, intelligent, can kill all the people in the cafeteria in under twenty seconds. Known even amongst the Blade Children as a particularly dangerous one, called the "Gun With Wings" by the Hunters, woos the ladies with one smile. In the manga, he has "battle reflexes" which mean he's more likely to kill you if you take him by surprise, but has vowed not to kill anyone else than Blade Children, whether out of his own decision or as a requisite for being a Hunter.He comes to Japan to exterminate all of the other Blade Children, starting with his friends, and if he can get Ayumu as well, all the better.He is Eyes' best friend since childhood and probably taught him to fight. Those two have an odd relationship in that they'll still always see each other as brothers, no matter what they do to each other - and in fact that's the exact reason they're doing it. He was himself taught in the way of violence since birth by his Action Mom, Evangeline Hilbert, herself an infamous member of the Special Forces. Evangeline is never seen but theorized to still be alive.
Sayoko ShiranagataniA soft-spoken, delicate girl, also a student at Tsukiomi, involved in a murder case Madoka is in charge of. In the anime, she was also the victim of an assassination attempt in the previous case. She is partly amnesiac; she initially wishes to remember her past, but eventually decides to take the opportunity to lead a normal, happy life, unaware of her nature. No one is quite sure whether this will enable her to evade the curse.Her mother eloped, then came back to her father to beg him to take care of a young Sayoko, and died shortly thereafter. Sayoko now lives with her grandfather and cousin, Kei, who studies music in college and is a big Eyes Rutherford Fangirl.
Kirie Tsuchiya"Tsuchiya Kirie, a twenty-seven year old lady with good looks and brains."A member of the Watcher faction, who claim to be entirely neutral and simply watch over the Blade Children. She is sent to watch over the battle with Kanone and mediate between him and the police, and generally be intentionally unhelpful and disclose as little information as possible. She is usually an even-tempered, mellow, unflappable and straightforward woman, but easily loses her cool when things go an unexpected way. She believes nothing anyone can do can go against Kiyotaka's plans - the problem is, no one knows what that bastard is planning exactly.Spiral: Alive shows that she has been working for Kiyotaka since a little before his disappearing act, and she's one of the few to still have contact with him. Not that she's happy about it. Hizumi calls her "Kirie-chan" and enjoys teasing her/driving her up the wall.
Mizushiro HizumiThe Devil. Also unbearably cute. With slightly violent tendencies. And suicidal tendencies. And overly friendly tendencies. Is supposed to bring about the end of humanity and will make you feel sorry for him about it.
Kiyotaka NarumiThe Chessmaster behind it all.
Spiral: Alive Characters
Characters who are exclusive to the prequel manga Spiral: Alive. Other appearing characters are listed above.
Imari SekiguchiA very high-spirited high school girl whose goal in life is to catch Sawamura's heart ever since she met him. Very honest and brutal, she scares lots of people but she's really nice. As long as you don't step in-between she and Sawamura.Because of her ties both with Sawamura and her love rival Amanae, she gets entangled in a case of serial murder of Blade Children and ends up helping Kousuke in his investigating. Well. "Helping"...
Yukine Amanae a.k.a. CharlotteA beautiful, even-tempered girl and Sawamura's girlfriend. At the beginning of the manga, she murders a string of unregistered Blade Children to attract Kiyotaka's attention. Her motives are unknown.Her parents were scientists affiliated to the Blade Children project, but her entire family died in a fire 9 years prior to the manga. Her parents were apparently killed by her younger adopted sister, Charlotte, one of the Blade Children, who was five at the time. Amanae seems to believe doctor Sheffield intentionally had her "switch" pressed and seek revenge for her family and little sister.But... the Amanae we know is actually Charlotte, seeking revenge for Yukine.
Shirou SawamuraA high-school boy with a cute face, sunny personality and very strong sense of justice. He seems to admire Kiyotaka and wants to "catch up to his level".He and Amanae are dating, but when he discovers her crimes he hands her over to the police - but still tries to "save her" from herself.When he was younger, he was taken hostage by a criminal woman (probably a Hunter who had just killed a handful of very young Blade Children) and suffered a mild version of Stockholm Syndrome. Kiyotaka waltzed in and told the woman that everything was alright and she could die now - whereupon she thanked him and committed suicide. Sawamura was shocked and believes she could have been saved; he wants to understand Kiyotaka to know if that was really the best course of action even for the woman herself, as Kiyotaka later told him. Since she looked a lot similar to Amanae, Sawamura now wants to make up for not having been able to save that woman by saving Amanae.
Tohru SaekiThe detective in charge of the Music Box Murders case, Madoka's colleague, used by Kiyotaka as a cab driver.