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Voiced by: Eri Kitamura (JP), Kari Wahlgren (EN), Joël Mulachs (SP), Gabriela Ugarte (Latin-American SP)
Saya Otonashi is the main protagonist of the series Blood+ and the first born of the daughters of the Chiropteran Mummy. She is a pure blooded Chiropteran queen (and Diva's older twin sister) as well as Hagi's lover.
- Action Dress Rip: In the middle of a fight at the Metropolitan Opera House, Saya realizes that the evening gown she wore in is too restrictive and so takes the liberty of tearing most of the lower portion off for more ease of movement, leaving her legs bare.
- Action Girl: Was one before the series begins, though she doesn't initially know it. She eventually gets back into the habit of kicking monster tail.
- Amnesiac Dissonance: Starts out the series amnesiac, and slowly regains her memories over the course of the first two seasons.
- Angsty Surviving Twin: Even after everything Diva has done and the years Saya spent preparing to kill her, Saya was very badly-shaken when she realized that she wasn't going to die alongside her sister as she had planned. When only Diva started to crystallize and called out to Saya in shock, a completely horrified Saya immediately ran up to her and tried to keep her petrifying sister from crumbling away. She broke down into anguished sobs and screamed in despair when Diva died anyway. At least part of Saya's grief was finally understanding that Diva had only ever wanted to get the chance to enjoy life and have a family, and realizing the full tragic scope of Diva's life.
- Animals Hate Her: Every animal she encounters over the series slinks away at the sight of her.
- Anti-Hero: Witness the magic of Character Development as Saya evolves from being a Classical Anti-Heroine to being a Knight in Sour Armor to being a Pragmatic Heroine.
- The Atoner: The entire series chronicles her attempts to kill Diva and make up for the mistake she made by releasing her in the first place.
- Badass Adorable: An incredibly formidable chiropteran-slayer, a chiropteran queen herself, and the only hope Red Shield (and the world) has, all in the form of one cute teenager. Hmm, that actually sounds familiar.
- Big Eater: An instance of Fridge Brilliance: Saya only receives just enough blood to keep from getting thirsty, but her body still needs more energy. Human food isn't quite enough to match up to blood, which is why she burns through calories so quickly and has to eat so much.
- Blinding Bangs: After the Time Skip. It's used to show her new Darker and Edgier personality.
- Blood Is the New Black: You can count the number of times she hasn't been drenched head to toe in her enemies' blood or her own on one hand.
- Boomerang Bigot: Bears considerable disdain for most other chiropterans despite being one of them. See Took a Level in Jerkass below. It's probably justified considering most other chiropterans's disregard for human life and bloodthirstiness. Saya was raised to identify as a human. Other chiropterans kill humans without a second thought. Given that, it's only natural that Saya would cling to her alignment with humans and look at other chiropterans with disdain and distrust.
- Boyish Short Hair: From at least the Russian Revolution onward. According to the Adagio manga, after having a nightmare of Diva's rampage at the Zoo and mistaking her reflection for Diva, she freaked out, messily chopped off her hair, and then had Haji fix it, resulting in its current style.
- Break the Cutie: It starts when she frees Diva from the tower, and all goes downhill from there.
- Bring My Red Jacket: Starts wearing a maroon coat after the Time Skip.
- Broken Bird: Once she gets her memories back, she gets broken and bitter. Probably has something to do with three lifetimes's worth of bloodshed, fighting, monsters, evil global conspiracies led by her twisted twin sister who murdered her father-figure along with most of the people she knew and destroyed her home, having condemned Haji to a terrible, endless life as her chevalier, and struggling to cope with the knowledge that she herself is just another monster that caused all of this to happen and needs to die as soon as she kills her sister.
- But Not Too Foreign: Sort of. She's technically French because of her place of "birth," but can easily pass for Japanese.
- Cain and Abel: The Abel to Diva's Cain. Although in the end, Saya is the one to kill Diva.
- Character Development: A year after Riku's death, Saya exhibits a much darker and embittered disposition, having fully regained her memories but in the process of lost hope, as Moses and Lulu both note. She is unwilling to associate or work with others, particularly Kai and the rest of the Red Shield, not wanting to have to experience losing more loved ones. During the last half of the series, she slowly comes to accept their help.
- Cute Bruiser: A cute teenage girl who can fight giant monsters with ease.
- Dark Is Not Evil: She tends to wear dark colors, like maroon and black, but is The Hero of the series.
- Death Seeker: Ultimately subverted. Saya only allows herself to live in order to kill Diva, and plans to either die with Diva or have Haji find a way to kill her afterward. Despite this, she secretly does want to live. In the final episode, Haji and Kai persuade her that she doesn't need to kill herself out of guilt or to end the chiropteran threat.
- Deliberate Injury Gambit: Her final defeat of Karl. When Karl has her at his mercy and is about to kill her, Saya, realizing she has too much to live for, runs herself through with her own sword and skewers Karl as well, killing him.
- Despair Event Horizon: She hits it when Diva rapes and kills Riku; several characters even remark that she has lost hope.
- Drama-Preserving Handicap: As the series finale approaches, Cinq Fleches begins putting the Evil Plan into action, which includes transforming the human population into chiropterans and killing Saya to put an end to the threat she poses. Unfortunately, all this is happening at the same time that Saya's body begins preparing for its next thirty-year hibernation—meaning that she suffers from Power Degeneration that hinders her newly-regained fighting capabilities and might not even be able to confront Cinq Fleches in time before she goes to sleep. Awful, awful, awfully convenient timing.
- Dude Magnet: Just ask Hagi, Kai, and Solomon.
- Earn Your Happy Ending: She goes through over a century of physical and psychological pain, and will have to lose thirty years with her loved ones due to her hibernation first, but with Diva and Amshel dead, Saya finally gets to hang up her sword and live her life in peace with her family.
- Easily Forgiven: For her actions during the Vietnam War. Granted, she wasn't in her right mind at the time, but still, she killed dozens of innocent people, including women and children, chopped off Haji's arm, and personally slew David's father, and all she gets is a slap on the wrist. Almost makes the Red Shield seem like a bunch of hypocrites for giving her so much slack while they are convinced that Diva is an irredeemable monster. Again, justified by the circumstances: Saya is normally undyingly loyal to humanity, but was in a mindless frenzied state at the time (she didn't even recognize Haji) because she had been taken out of hibernation too soon and woke up in the middle of a war-zone crawling with chiropterans, bombs, and gun-fire. When Saya was herself again later on, she was horrified and remorseful over what she did in Vietnam, even before she consciously remembered it. The only reason the Red Shield continued to ally with Saya was because it was necessary, seeing as how her blood was the only weapon capable of killing the much more pressing threat—chiropterans in general and Diva and her chevaliers in particular. Still, the Red Shield was pretty wary around Saya at this time because they knew what had happened in Vietnam, and David had a hard time forgiving her even though he knew and accepted that Saya was necessary to their mission and that she hadn't been in control of herself in Vietnam.
- Even the Girls Want Her: Saya seems to have girls crawling into bed with her with alarming frequency: Kaori, Minh, Sonya (though the last wasn't actually a girl)...
- Expository Hairstyle Change: The Time Skip has her hair with bangs, signifying her loss of innocence.
- Friendly Neighborhood Vampire: Or Chiropteran Queen, to be more exact. She's a friendly girl who doesn't want to eat you.
- Good Thing You Can Heal: Which enables her to pull off a Deliberate Injury Gambit and survive.
- Hallucinations: Experiences several early on in the series, mostly about what she did in Vietnam.
- Heartbroken Badass: Life has definitely not been kind to her since she freed Diva. Because of this, Saya is determined to kill all chiropterans.
- Heroic B.S.O.D.: A big one after Riku's death.
- Hunter of His Own Kind: Female version. A chiropteran who hunts other chiropterans, a fact she prefers not to dwell on.
- I Work Alone: Develops this attitude after the Time Skip because she doesn't want to suffer the loss of any more of her loved ones and friends. She eventually snaps out of it.
- Immortality Begins at 20: Stopped aging when she turned sixteen.
- It's All My Fault: Her word-for-word reaction when she remembers that she was the one who originally freed Diva.
- Jerkass Realization: In the flashbacks in episode 22, Saya gets exasperated with Haji for his refusal to cooperate with her and tells him to go back to where he came from, only to be taken aback when Haji breaks down and informs her that he's not at the Zoo by choice and that Joel and Amshel bought him. It's this realization that marks Saya's change from Spoiled Brat to a more self-aware person.
- Kiss of Life: Thrice with Hagi: the first time (chronologically), it was so that she could give him her blood to recuperate, accidentally turning him into a chevalier when he was on the brink of death but saving his life; the second time (chronologically), it was so that he could give her his blood to trigger her latent memories and powers, enabling her to kill an attacking chiropteran and save the day; the third time (chronologically), they share an emotional kiss after Haji convinces Saya not to kill herself.
- Lightning Bruiser: Very agile and strong, and able to take quite a bit of damage without being slowed thanks in part to her Healing Factor.
- Locked Out of the Loop: When she is recruited back into the Red Shield while amnesiac, both Haji and David repeatedly refuse to tell Saya anything about her past or mission, insisting that she has to remember on her own. Of course, this results in Saya being forced into horrific bloodshed and countless Break the Cutie moments without even knowing why, but either way...
- Muscles Are Meaningless: She's tiny, but can easily overpower and chop chiropterans in half. Since she's a Chiropteran Queen, this makes sense.
- My God, What Have I Done?: Her reaction to killing some of her allies while in her Berserk Mode and after being forced to turn Riku into a chevalier to save his life.
- Neutral No Longer: Having previously been extremely hesitant to jump into the fray against chiropterans, Saya decides to go with Haji and the Red Shield after she loses George.
- Nice Job Breaking It, Hero!: There surely could never be a reason why that girl with the beautiful voice is locked away in a tower on your foster father's property...
- Oblivious to Love: She had no idea that Haji was in love with her throughout the past hundred-plus years of their association. While Hagi is The Stoic and so at least somewhat believable, she also never catches onto Kai's blatant non-brotherly feelings for her. Factor in her harem of girls she doesn't show anything but friendship towards and for a while there, Solomon and Karl were the only ones she seemed aware of as having romantic feelings for her (and possibly vice-versa, in Solomon's case) at all. When you know enemies you've only just met have feelings for you, but not any of the friends you've spent a year or more in the company of, you know you're Oblivious to Love. Or maybe you don't know, since that's the whole point of the trope.
- The Only One Allowed to Defeat You: Saya sees the task of killing Diva as her personal duty, and tries to dissuade others from joining her in her quest. This isn't just a matter of It's Personal as it usually is with other examples (though considering the grief Diva has caused her, that certainly figures into it as well), but out of pragmatism and a sense of responsibility—Saya's blood is the only thing that can kill Diva.
- Out, Damned Spot!: During the Vietnamese boarding school arc, Saya is washing her hands when she hallucinates that they are covered in blood, symbolizing her subconscious guilt over all the innocent blood she spilled in Vietnam the last time she was there.
- Power Degeneration: A non-fatal variation. As Saya nears her next hibernation period, she suffers from bouts of fainting spells and her Healing Factor begins to lose its potency.
- Pro-Human Transhuman: Having been Raised by Humans, Saya is on the side of humanity no matter what.
- The Promise: She made Hagi promise her that he would kill her after she kills Diva. Fortunately, he instead manages to talk her out of it and persuade her to live on.
- Really 700 Years Old: She's almost two hundred years old. Though with all her long naps and amnesia, she doesn't have much built up wisdom.
- Red Eyes, Take Warning: Inverted. The red-eyed Saya is the hero pitted against blue-eyed Diva.
- Red Is Heroic: She's the main character of the series, has red eyes, and wears a dark red coat after the Time Skip.
- Red Oni, Blue Oni: The Blue to Kai, Mao, and (ironically) Diva's Red.
- Scarf of Asskicking: A pink scarf is part of her evening gown ensemble at the Metropolitan Opera House fight, but she loses it almost immediately in the battle.
- School Uniforms Are the New Black: Played with. Though most promotional materials and video games depict her in her school uniform, she mostly wears casual clothes in the series itself.
- Spoiled Brat: Starts out as very bratty due to her upbringing under the first Joel Goldschmidt, but mellows out through her friendship with Haji.
- Sympathy for the Devil: Despite her long-running mission to kill Diva, Saya still feels sorry for her due to her Freudian Excuse. When she finally succeeds at killing her, she considers it a hollow victory and breaks down in tears.
- Tomato in the Mirror: Her reaction to realizing she's a chiropteran.
- Took a Level in Badass: Played with in a weird way. For a while, Saya is is only really useful in a fight if she slips into one of her Unstoppable Rages. However, she actually was a skilled fighter before the series began, and has only deteriorated because she lost her memories, making this more of an in-universe example of Badass Decay. However, when Saya finally remembers who she is, she remembers how to deal with chiroptera... which spells bad news for any weird blood-sucking bat monsters dumb enough to leave a trail.
- Took a Level in Jerkass: After regaining her memories in the manga. She even flatly tells Riku she's going to kill him because he's a chiropteran. Considering what she was going through, it's understandable, and she seems to be uncertain about it afterwards. (Still pretty mean, though, Saya.)
- Vegetarian Vampire: Sort of. Saya largely refrains from drinking any kind of blood, human or animal, and gets the blood she needs through blood transfusions instead.
- Weak, but Skilled: Since Saya refrains from eating people, she is barely stronger than ordinary humans, but is able to hold her own against other chiropterans due to martial arts skills.
- Willfully Weak: She suppresses her natural abilities and refrains from drinking blood as much as possible; as a result, she's barely stronger than a human. If she tapped into her powers and had enough blood, she'd be Diva's equal.
- You Are Not Alone: After the Time Skip, she isolates herself from the Red Shield, not wanting to lose any more loved ones. Her friends repeatedly work to help her understand that it's not just her burden to bear alone.
Voiced by: Katsuyuki Konishi (JP), Crispin Freeman (EN), Toni Mora (SP), Manuel Díaz and Gerardo García (Latin-American SP)
Hagi is Saya's first and only living chevalier and also her love interest.
- Absurdly Sharp Claws: His claws can easily cut through flesh and bone; in episode 13, he even effortlessly chops a chiropteran's head off with them.
- Badass Longcoat: A downplayed example, but his old-fashioned tailcoat does cause him to cut a striking figure, especially in combat.
- Bishōnen: In the novelization Mao grumbles about how he's so pretty, it's annoying because it's so distracting.
- Cannot Spit It Out: Surely taking 130 years to tell the woman you love how you feel must be some kind of record.
- Dark and Troubled Past: Implied. Haji's parents sold him to Joel I and Amshel for a loaf of bread.
- Determinator: Absolutely nothing stands in his way if Saya's safety is threatened.
- Distressed Dude: Spends his time in the prequel manga City of the Night Walkers/Blood+: Kowloon Nights unconscious, in chains, and in the arms of another man until he snaps out of his funk and wipes the floor with his captors.
- Dying Confession Of Love: Finally confesses his feelings for Saya before he is apparently killed in the MET bombing. Subverted, as the final scene of the anime reveals he survived.
- Eerie Pale-Skinned Brunette: He's initially an ambiguous and somewhat threatening figure, an impression certainly helped along by his dark hair and pale complexion. Even once it becomes clear that he's a heroic and utterly trustworthy person, his extreme stoicism and chevalier abilities - as well as the fact that he keeps feeding Saya his blood - makes him a bit otherworldly.
- Extreme Doormat: "If that is your wish" is his Catchphrase. Kai calls him out on it. In the finale, he would have just stood by and let Saya kill herself if Kai hadn't stepped in.
- Good Thing You Can Heal: As a chevalier he can recover from injuries that would've killed any human, and the series takes full advantage of this fact, meaning that Hagi gets maimed for drama pretty often. At one point he's impaled by what appears to be a railroad tie.
- Go Out with a Smile: Just before being buried under rubble in the MET.
- Happiness in Slavery: He is unshakingly loyal to Saya to the bitter end, and not just because he's biologically hardwired to be as such as a Chevalier.
- I Am Not Left-Handed: He hides his Chiropteran body parts, such as his claw and wings, because Saya expressed horror at them when she first saw them. He'll bare the claw for fighting, but it's only at the very end of the series that things get serious enough for him to reveal his wings in order to save Saya.
- Improbable Weapon User: A cello case and with a cello in it.
- Innocent Cohabitation: With Saya, during Time Skip and probably before as well.
- Instrument of Murder: The cello is more invincible than Hagi is!
- I Want My Beloved to Be Happy: Despite his love for Saya, he believes that, as her chevalier, his duty is to protect and help her and not reveal his feelings for her.
- I Will Wait for You: During Saya's hibernation periods, he kills time until she wakes up.
- Knife Nut: Seemingly able produce an endless supply of throwing knives out of nowhere.
- Living Forever Is Awesome: Haji is proof that this trope is not for loners; he appreciates his immortality because without it he couldn't serve his mistress when she's awake or watch over her when she hibernates. Though one must wonder what he does during the latter.
- Mistress and Servant Boy: With Saya before and after the Time Skip.
- Mr. Fanservice: Lampshaded in the anime when Saya has to infiltrate a Vietnamese boarding school and Hagi poses as a gardener to protect her. Cue squealing fangirls.
- Partial Transformation: The most we ever see of his chiropteran form are his claws and wings.
- The Promise: Promised to kill Saya after she kills Diva. Of course, afterwards, he breaks that promise and convinces her to live on.
- Senseless Violins: Cellos in this case.
- Shapeshifter Mode Lock: Haji's right hand is permanently Chiropteran after a berserk Saya chopped it off during the Vietnam War. He hides it by keeping it wrapped up in bandages, only exposing it when The Gloves Come Off.
- Slipknot Ponytail: His hair coming loose from its ribbon is invariably a sign that Hagi is taking a nasty beating.
- Spell My Name with an "S": Hagi or Haji?
- Willfully Weak: Suppresses a lot of his natural abilities because when Saya first saw him use them, she was terrified. He also basically starves himself of blood, which is why he is not as strong as the other chevalier, though if he tapped into his natural abilities and had enough blood, he would probably be second only to Amshel.
Voiced by: Hochu Otsuka (JP), Wally Wingert (EN), Antonio García Moral (SP), Germán Fabregat (Latin-American SP)George Miyagusuku was an Okinawan-American US Army veteran and the adoptive father of Kai, Riku and Saya.
- Cool Old Guy: He is a kindly adoptive father to Riku, Kai and Saya, doing everything in his power to raise them so they will be happy and even spends his dying moments giving them some words of wisdom.
- Parental Substitute: All three of the children in his care lost their parents a long, loooong time ago, in Saya's case and he does all he can to give them a good home life as their adoptive father.
Voiced by: Hiroyuki Yoshino (JP), Ben Diskin (EN), Dani Albiac (SP), Gabriel Ortiz (Latin-American SP)Kai Miyagusuku is one of the main protagonists of the series. He is the adopted son of George Miyagusuku hence, Riku and Saya's "elder" brother.
- Abnormal Ammo: After the Time Skip, he uses special incendiary rounds that explode on contact; slightly better than conventional bullets against chiropterans, but not by much.
- Adoptive Peer Parent: In the epilogue after he adopts Diva's daughters.
- Badass Normal: After the Time Skip, even though he is still a normal human being without any special abilities, he becomes competent enough to stand his own against a chiropteran for a time, just like David and Lewis.
- Big Brother Instinct: Towards Saya and Riku, naturally. He also seems to get along very well with kids who aren't related to him.
- Character Development: Riku's death changes Kai. He faces his responsibilities, hones his skills to be ready, bears the torch of Red Shield to keep hope alive. He believes that Saya will come and his faith pays off.
- Earn Your Happy Ending: Kai lives to return to his family's restaurant and presumably accomplishes his dream of running it with his family, although the ones he gets are admittedly not exactly the ones he was expecting. Kai loves the girls like his own regardless. Plus, he has the promise of his sister one day waking up and coming home to look forward to...
- Happily Adopted: Both he and Riku were adopted by George after their biological parents died.
- The Heart: Becomes this for Saya and Haji after the timeskip, trying to make them work again with the Red Shield and leave behind their lonely attitude.
- Jerk with a Heart of Gold: Before the timeskip he was very rude and stubborn, an attitude that annoys David greatly. He becomes better after the time skip, though.
- Not Blood Siblings: Kai is very heavily implied to have romantic feelings for Saya. That Saya clearly sees him as a brother, coupled with the show and the characters' emphasis on family, may make some viewers a little uncomfortable with the incestuous overtones. It makes sense when you realize that they met and became siblings only a year before the series starts and, well, they are hormone-addled teenagers. (Kai is, anyway.) Kai never really expresses his feelings to Saya, leaving it up in the air whether he still wanted to pursue a romantic relationship with her in the future. It's hinted by the end of the series that he has accepted that Saya loves him but in a platonic way and that his crush on her has turned into something more familial... which was probably helped by losing every other member of their family...
- Oblivious to Love: Ironically, just as Saya doesn't notice his romantic attraction towards her, Kai doesn't realize that Mao loves him and is confused when she kisses him.
- Parental Substitute: To Diva's daughters. Guess he takes after George.
- Took a Level in Badass: After the timeskip. He became much more useful and is capable of destroying Corpse Corps and design a plan to defeat James.
- Took a Level in Kindness: After Riku's death he matures greatly and becomes a much more nice person in comparison with his past self.
- Tragic Keepsake: He keeps his late adoptive father's gun.
- Use Your Head: Using a combination of this and Get a Hold of Yourself, Man! is probably his most notable Character Tic in the manga.
Voiced by: Akiko Yajima (JP), Kamali Minter (EN), María Rosa Guillén (SP), Eduardo Curiel (Latin-American SP)Riku Miyagusuku is the adopted brother of Kai and Saya, the youngest of George Miyagusuku's three adopted children and Saya's second chevalier.
- Absurdly Youthful Father: Had he actually lived, he would have been 13 when his daughters were born.
- Adaptational Badass: While in the anime, he dies before being able to develop his Chevalier powers, in the manga, he manages to master them and becomes a powerful ally of the Red Shield.
- Break the Cutie: Being raped and murdered by Diva.
- Emergency Transformation: Made into Saya's chevalier after Diva drains his blood at the Zoo.
- Happily Adopted: Like the rest of George's kids.
Voiced by: Jurota Kosugi (JP), Christopher Nissley (EN), Alfonso Vallés (SP), Rolando de Castro (Latin-American SP)David is a member of the Red Shield. He works as an agent assigned to direct collaboration with Saya.
- Adaptational Villainy: Unlike in the anime, David is shown to be cold and harsh towards Saya in the manga. He sees her nothing but a weapon.
- Badass Normal: Unlike Saya, he hunts vampire-like monsters without any inherent special abilities.
- Good Is Not Nice: He completely pounds Kai early on to teach him a lesson about the kind of world they're in and forces Saya to fight despite full knowledge that it's tearing her apart.
- Heroic B.S.O.D.: After Red Shield's headquarters are destroyed, Riku is killed, and Saya disappears without a trace.
- He's Back: When Saya and Haji return after the Time Skip.
- Odd Friendship: Seems to have an odd sort of bond with Haji, of all people, and is something that, while subtle, actually occurs throughout much of the series.
- Red Baron: "David the Invincible"
Voiced by: Yuko Kaida (JP), Abby Craden (EN), Gabriela Gómez (Latin-American SP)Julia Silverstein is a medical doctor working for the Red Shield and is also involved in chiropteran related researches. She graduated from Sorbonne University, the same University as Van.
- Dude, She's Like, in a Coma!: A gender inverted example. After David saves her from getting shot by Collins, literally Taking the Bullet in the process, Julia kisses an unconscious David after he gets out of surgery.
- Face–Heel Turn: She is convinced by Collins to defect to Diva's side along with him...
- Heel–Face Turn: ...She returns to the Red Shield one year later after Collins tries to kill her and David saves her.
- Unresolved Sexual Tension: With David. They resolve it in the end.
Voiced by: Takashi Nagasako (JP), David Rasner (EN), Vicente Gil (SP), Salvador Reyes (Latin-American SP)Lewis is a regular member of Red Shield and is responsible for providing gadgets and transportation for the organization's operatives.
- Big Eater: He loves to eat.
- Big Fun: The carefree Lewis is the biggest case of comic relief in the series, and that's taking into account that the series is very serious.
- Crouching Moron, Hidden Badass: Despite his appearance and comic relief status, he is capable of fight a Chiropteran as good as David is.
- Nice Guy: A cheerful and happy man.
- Shipper on Deck: He plays cupid for David and Julia.
- Sunglasses at Night: Wears his black sunglasses even at night time.
Joel Goldschmidt VI
Voiced by: Akira Ishida (JP), Crispin Freeman (EN), Jordi Nogueras (SP), José Gilberto Vilchis (Latin-American SP)Joel Goldschmidt, the head of the Goldschmidt clan, was a wealthy researcher who studied evolution of beings.
- Big Good: Being the leader of Red Shield, he is the person that is concerned the most with protecting the people from the chiropterans.
- Bishōnen: Very pretty for a man of his age.
- Handicapped Badass: He ends up paraplegic thanks to Karl, but it doesn't stop him from leading the Red Shield.
- Nice Guy: Compared to David, he is very nice with Saya the first time he meets her and treats the Red Shield pretty well in general.
Voiced by: Hideyuki Umezu (JP), Steve Blum (EN), Tasio Alonso (SP), Raúl de la Fuente (Latin-American SP)Professor Collins has been in the hierarchy of Red Shield directly behind Joel Goldschmidt.
- Ambition Is Evil: The whole reason he betrayed the Red Shield for Diva's group in the first place is because he wanted to make his research on chiropterans public, which the Red Shield forbade him from doing.
- Face–Heel Turn
- Green-Eyed Monster: After Amshel appoints Julia to be Diva's personal physician over him, Collins loses his shit and tries to shoot her in a jealous rage.
- What Happened to the Mouse?: Halfway through season four, he shoots David, gets shot in the arm in return, and... never appears again.
Voiced by: Ami Koshimizu (JP), Olivia Hack (EN), Marta Estrada (SP), Mariana Ortiz (Latin-American SP)Mao Jahana is Kai's classmate in Koza Commerce High School who is obsessed with him. She is the daughter of the head of the Jahana Yakuza.
- Armor-Piercing Slap: Delivers one to Saya after discovering that Saya's next hibernation period is coming and Saya didn't think it important to tell anyone.
- Demoted to Extra: Only appears as a very minor character in the manga, first bullying Saya because she's jealous that she lives with Kai, then recruits Saya to be in the school play in hopes that Kai will come and watch.
- I Want My Beloved to Be Happy: To Kai.
- Jerk with a Heart of Gold: Abrasive, blunt, and very tsuntsun aside, Mao is a genuine good girl in the end.
- Matchmaker Crush: Despite having feelings for him, Mao helps Kai confess his love to Saya.
- Odd Couple: With Okamura; the Yakuza Princess and the reporter of the supernatural.
- Running Gag: Pulling cigarettes out of Okamura's hand before he gets a chance to smoke them.
- Ship Tease: Despite her crush on Kai, has a few moments with Okamura.
- Shipper on Deck: Makes a couple of attempts to set Saya and Kai up during season four.
- Spoiled Sweet: She's remarkably nice considering her dad's status and wealth.
- Stalker With a Crush: Mao steals fifty million yen from her mob boss father's untraceable cash stash to follow Kai across the world.
- Tsundere: Dere for Kai, tsun for everyone else, especially Okamura. At the end of the series, she prefers to continue traveling with Okamura, and keep him from smoking, instead of going home.
- What the Hell, Hero?: Along with the Armor-Piercing Slap moment mentioned above, Mao also chews Saya out for not bothering to tell anyone her next hibernation cycle is approaching when they've been working their butts off to help her.
- Yakuza Princess: Her dad's a mob boss and she certainly carries herself like a princess.
Voiced by: Kentaro Ito (JP), David Rasner (EN), Óscar Redondo (SP), José Antonio Macías (Latin-American SP)Akihiro Okamura is a somewhat jaded, down-on-his-luck, chain-smoking newspaper reporter and photographer for the Ryukyu Daily.
- Determinator: Nothing stops Okamura from following a good story.
- Guile Hero: He figures out things through just looking and researching like a normal (though also determined) reporter around the same time as Red Shield and was only a little behind them in knowledge by the time he officially joins them.
- Intrepid Reporter: He chases the vampire monster sightings across continents to be like his father.
- Odd Couple: With Mao.
- Ship Tease: With Mao at times.
- Smoking Is Cool: Nearly always seen with a cigarette in his mouth. This stops when he teams up with Mao; she pulls them out of his hand because she thinks the habit is disgusting.
Voiced by: Akiko Yajima (JP), Kari Wahlgren (EN), Gloria García (SP), Xóchitl Ugarte (Latin-American SP)Diva is the main antagonist of Blood+ and is the younger twin sister of Saya. She is the greatest sworn enemy of the Red Shield and, like Saya, is a pure blooded Chiropteran queen born from the Chiropteran Mummy.
- Adaptational Heroism: While both versions of Diva are Anti-Villains and Psychopathic Manchildren, the manga makes her a much more sympathetic character. Anime!Diva had a sadistic streak and often relished the thought of killing Saya, whereas Manga!Diva genuinely cares for both Saya and her Chevaliers, and doesn't seem to understand the difference between right and wrong. Also, she does not rape and kill Riku here.
- Alas, Poor Villain: An in-universe example. Saya starts bawling her eyes out after killing her, her plan originally having been to die with her.
- All Women Love Shoes: She sees a guy with cute sneakers, kills him, takes said shoes and wore them for the rest of the episode.
- Anti-Villain: Diva is on par with Lucy herself when it comes to sympathetic anime villainesses: from the moment she was born, baby Diva was separated from her twin sister and locked up in a lonely cage at the top of a tower for decades, with her only human contact being men who saw her as nothing more than an experiment or an animal. All she ever wanted was to have a family, but she was denied even that, and died right on the cusp of realizing her dream. Diva's story is so saddening that it makes you want to give her a hug. Except then she'd bite your neck and suck you dry, at which point you'd remember that there's a reason why she's an Anti-Villain.
- Being Tortured Makes You Evil: Let's face it: if you were locked up in a tower room and used as a lab rat for the first fifty years of your life, you'd most likely be as screwed up as Diva.
- Bifauxnen: After the timeskip, when she changes her face and her body to look like Riku.
- Big Bad: She is the most powerful enemy in the show and stopping her is Red Shield's goals throughout. Despite this, Diva simply takes a childlike interest in the destruction she causes. This is eventually subverted when it's revealed Amshel was merely using her for his own goals.
- Brown Note: Her singing activates Delta 67, a chemical agent Cinq Fleches works on infecting most of the population with. When it activates inside people, it transforms them into mindless, low-level chiropterans. Diva becomes a famous singer whose performances are broadcast across the world.
- Cute and Psycho: She childishly wrecks a dress so that Amshel will have to get her a new one, like a spoiled daughter. She also kills a man just because she wanted his shoes.
- Dark Action Girl: As an Evil Counterpart to Saya, Diva's a lethal fighter.
- Dead Person Impersonation: Tries this on Kai by creepily imitating Riku as a way to convince him to join her.
- Double Standard: Rape, Female on Male: Completely averted in-story, as her rape and murder of Riku is shown as her Moral Event Horizon crossing.
- The Dreaded: Is this to the Red Shield to the extent that, when he meets her face-to-face, Lewis is so thoroughly intimidated by her that he falls back on his ass in fear, and is extremely relieved when she chooses to pursue Saya over eating him.
- Evil Counterpart: Diva is what Saya would've been like if she had been the one locked in the tower instead of raised like a human. (Compare Zoo!Saya to Modern!Diva, for example.) After Diva's death, Saya even holds her hand and calls her "my other half" in the Japanese dub.
- Evil Is Hammy: In the English dub, anyway.
- Face Stealer: Spends much of Seasons 3 and 4 appearing as a paler, black-haired, blue-eyed version of Riku.
- Fan Disservice: She gets a Toplessness from the Back shot right before raping and killing Riku.
- Faux Affably Evil: Drinks human blood, kills people by the truckload, and rapes a boy in his early teens to impregnate herself, all while singing, prancing around in fancy clothes, and giggling childishly.
- Flower Motifs: Blue roses. They're everywhere around her and her chevalier.
- Freudian Excuse: Saya's "father" locked her up in a tower as part of his experiment, while he raised Saya lovingly. This experience drove her mad with grief and jealousy.
- Giggling Villain: Has an annoying childish giggle, and enjoys giggling.
- The Glorious War of Sisterly Rivalry: With Saya, as the "pretty" sister.
- Go Out with a Smile: In both the anime and manga series. Anime-wise, the last thing Diva does before she dies is smile at the cocoons of her babies and caress them. In the manga, it's to give Saya a smile when the latter is about to commit suicide, and use her last breath to tell Saya to live.
- The Heavy: Amshel is the one with the Evil Plan but Diva is the most powerful antagonist in the series, with stopping the untold destruction she directly causes being the reason for Red Shield to fight. Being that she is Saya's younger twin-sister also makes her the most personal enemy for the protagonist.
- Hoist by His Own Petard: Her rape and murder of Riku got her pregnant like she wanted, but the pregnancy sapped the poison out of her blood, thus disabling the only thing that could kill Saya. Therefore, when the sisters finally got their fight, Diva had absolutely nothing to kill Saya with and, after what Diva did to Riku (not to mention other people), Saya has every reason in the world to want her dead. It was only a matter of time before Saya succeeded in killing Diva.
- Immortality Begins at 20: Like Saya, she stopped aging at sixteen.
- Implacable Man: Female version. She's bent on finding and raping Riku. And she's not going to let anyone get in her way to achieve this goal.
- Large Ham: Especially in the English dub.
- Light Is Not Good: Diva's eyes are bright blue and she favors light clothing but she's also the most dangerous Chiropteran in the show.
- Lightning Bruiser: She's able to effortlessly throw Saya through a brick wall, Flash Step with ease, and take bullets to the chest while barely even flinching.
- Madwoman in the Attic: Cute Psycho in the Tower in this case.
- Major Injury Underreaction: In episode 24, she gets shot in the chest by David, and her sole reaction is to complain about the bullet hole in her dress. Of course, given her Healing Factor, it's probably not really a major injury to her.
- Meaningful Name: Because she, you know, she sings really well. The scientists who experimented on her didn't give her any name, but Saya named her when they were children after hearing her singing.
- A Million Is a Statistic: Quite a few people lost sympathy for Diva after she raped and killed Riku. Sure, never mind that she's filled entire graveyards over the past century. Even then, she won back some favor because of her love for her unborn babies... even though the way she expressed her motherly love was by planning to wipe the human race off the face of the Earth for them.
- Motive Rant: Gives one to Saya right before they fight at the opera house, in the hopes that her sister would agree and they wouldn't have to kill each other.
- Muscles Are Meaningless: She is the exact same size and weight as Saya, but is shown to be powerful enough to punch David across a room and then toss Saya clean through a brick wall without even trying. As the other Chiropteran Queen, and a well fed one to boot this is justified.
- Not So Different: She feels that she and Saya are the same, being not only chiropterans but also twin sisters. The similarities run even deeper than either of them realize: they both want to have a family, they both want to have a happy life, and they are determined to wipe out an entire race in order to preserve their own. At first, Saya vehemently argues against the idea that she is anything like Diva, but after killing Diva she rather solemnly acknowledges Diva as her "other half" in the original Japanese.
- Pimped-Out Dress: Diva loves to dress up in beautiful dresses, the weirder, the better. Of particular note are the dress... thing she wears when she attacks Riku and destroys the Red Shield's headquarters that is just a frilly white cape clasped at the throat, with evening gloves and sneakers, and the black-and-blue gown she wears to her fight with Saya at the Metropolitan Opera House. Going by the latter outfit's tiara and bat-like wings, it's supposed to show Diva's status as the queen of the chiropterans, but it just looks... odd. The "weird" aspect to her dresses make sense if Diva dresses herself.
- Power Degeneration: Nathan explains that as a result of Diva's pregnancy, her blood lost its toxic property. She never realized this, since there was so little information on her species and none at all on what happened when queens became pregnant. When Diva faced off against Saya in their final duel, she effectively went into a gunfight with an unloaded gun.
- Psychopathic Womanchild: She acts completely childish and immature, even though she's Really 700 Years Old.
- Rape Is a Special Kind of Evil: Her rape and murder of Riku is depicted as an in-universe Moral Event Horizon crossing.
- Raven Hair, Ivory Skin: Black-haired, white-skinned Diva is described as "the most beautiful and dangerous woman" by one character. The crowning example of the series.
- Red Oni, Blue Oni: Childish Diva is the Red Oni to withdrawn Saya's Blue Oni.
- Roaring Rampage of Revenge: The very first thing that Diva does when Saya releases her from the tower is butcher Joel I and the patrons at his birthday party in retribution for all of the pain and suffering Joel put her through.
- Stalker With a Crush: Poor, poor Riku.
- Stalker with a Test Tube: Seeks to rape Riku so she can impregnate herself.
- Super Strength: In episode 24, she flings Saya clean through a brick wall with such force that when Saya hit the ground, the ground actually collapsed under the impact.
- The Vamp: Diva is not shy about using the art of seduction to get what, and who, she wants.
- Unskilled, but Strong: To contrast Saya's Weak, but Skilled. Diva is nowhere near as skilled as Saya with a sword, but her raw strength and speed more than makes up for it.
- Walking Spoiler: Trying to find out anything about her prior to watching Episode 24 is a perfect way to spoil the first half of this series.
- Woman in White: Nearly every outfit she wears is all-to-mostly white, playing up the Light Is Not Good aspect of the character.
- Would Hurt a Child: Not only would she hurt a child, she'd take pleasure in doing it. Just ask twelve-year-old Riku. Whom she killed. And then raped. And then killed again.
- Adaptational Wimp: In the anime, they are able to transform into Chiropterans to fight at their 100%, and each one of them have an special ability who makes them deadlier in a battle. In the manga, however, the most they can transform are their arms (with no implications they can go One-Winged Angel either), and, apart of Solomon's sword, they don't posses special powers. Also, James and Nathan have a much small role, with the first being killed in his very official debut.
- Blood Brothers: They all share Diva's blood, operate closely together and refer to each other as brothers.
- Man of Wealth and Taste: They all dress well and are seen in upper-class establishments. Fitting, as they pose as members of a lucrative business.
- One-Winged Angel: Each can take on a monstrous combat form, which they use when they want to get serious in combat.
- Really 700 Years Old: With the exception of James (who was turned into a Chevalier during World War II, thing who would make him 70/80 years old at the time the series started), every one of them are older than 100. Amshel became one in the 18th century, Solomon and Karl approximately during World War I, and there's Nathan, who is implied to be even older than Amshel.
- Red Eyes, Take Warning: Their eyes glow red when they pull out the guns.
- Undying Loyalty: Towards Diva, by instinct. Though it is possible for them to overcome this.
Voiced by: Joji Nakata (JP), Wally Wingert (EN), Ramón Rocabayera (SP), José Luis Rivera (Latin-American SP)Amshel Goldsmith was the assistant of the original Joel Goldschmidt. He was Diva's first chevalier.
- The Ace: Diva's most powerful Chevalier, who easily defeats Saya and Haji in their first encounter without a scratch and rips Solomon's arm off when he announced his desertion in a battle that he ends intact.
- Ambition Is Evil: Everything he does is because of his desire to find out everything he possibly can about chiropterans, and if that means overstepping all kinds of moral bounds and nearly causing The End of the World as We Know It, it's a small price to pay.
- Badass Baritone: And by Joji Nakata, no less.
- Beard of Evil: Amshel is one of three major characters with a beard and the only villainous one. His is styled as a thin goatee, kept neatly filed, which is befitting of his status as a Corrupt Corporate Executive.
- The Chessmaster: He knows how to play Diva like a fiddle, using her love of destruction to his own advantage and convincing her to sing on stage so he can use her voice to turn people into chiropterans.
- Corrupt Corporate Executive: Amshel takes on the appearance of a businessman so he can secure funding for researching chiropterans and maintain his own power.
- Creepy Crossdresser: First appears disguised as an old woman, then kills a Red Shield operative and spends the next few episodes disguised as her. And in the last few episodes, he arrives for the final battle disguised as Diva to buy time against Saya.
- Curb-Stomp Battle: His initial battle with Saya in the present day. It ends with Amshel crushing Saya's arm and breaking her sword.
- Dragon-in-Chief: He is Diva's first Chevalier and runs Cinq Fleches' business operations while Diva is content to cause mindless destruction. He also plans to use Diva for his own ambitions by taking advantage of her Compelling Voice, while she just likes getting the chance to sing on stage. Amshel also survives Diva's death and becomes the final antagonist to be defeated.
- Evil Genius: Amshel runs the business used to fund all of Diva's activities and is a capable scientist, with tons of research on chiropterans.
- Evilutionary Biologist: Is responsible for the creation of chiropterans and the Schiff.
- Face Stealer: He's introduced after having killed a Red Shield agent and using her form to disguise himself before attacking Saya.
- Greed: He wants to possess everything - money, power, Diva, Diva's children and control the whole world.
- Harmless Electrocution: Averted. After being impaled on the Chrysler Building's spire, Amshel is fried by a lightning bolt attracted by the spire's point. He survives (barely) but his healing factor has him stuck between his human and chiropteran forms when he returns to finish his fight with Haji.
- Impaled with Extreme Prejudice: He has this done to him by Haji during the climactic battle with Diva
- Mad Scientist: He wants to know everything there is to know about chiropterans and will do anything to learn. Anything.
- The Man in Front of the Man: While masquerading as a simple Dragon to Diva, the way she talks to Amshel makes it clear she looks up to him and his corporation means he's responsible for her and her Chevaliers' income and while she just wants to sing and cause chaos, it is Amshel who is the real mastermind, using her desires to fuel his own experiments. Flashbacks also reveal he's responsible for corrupting Diva after her and Saya's father mistreated her. He also steps up as the final obstacle once Diva has been killed.
- Rasputinian Death: Haji had a time and half making him truly dead.
- Taking You with Me: When Haji uses Saya's sword to kill him for good just before the MET is bombed, right before he completely crystallizes, he impales Haji with his claws and traps him, rendering him seemingly unable to escape the bombings.
- The Unfettered: He'll do whatever it takes to find out everything he can about chiropterans, committing such atrocities as performing genetic experiments on children and trying to turn everyone in New York City into chiropterans themselves.
Voiced by: Kouji Tsujitani (JP), Dave Wittenberg (EN), Enrique Hernández (SP), Víctor Ugarte (Latin-American SP)Solomon Goldsmith was Diva's fourth chevalier.
- Affably Evil: Despite being a supporter of Amshel and Diva, Solomon is very polite and handles himself with a gentlemanly demeanour in front of people. He even states that he doesn't like seeing people kill each other.
- Anti-Villain: Solomon felt driven to become a Chevalier because he wanted to escape the turmoil of fighting he saw between humans during World War II. When he falls in love with Saya he even goes so far as to betray Diva for her.
- Bishōnen: Solomon retains the appearance of a handsome, slender youth and his good looks are noticed by many female partygoers in one scene.
- Blade Below the Shoulder: His weapon of choice. He shapeshifts his hand into one.
- Chick Magnet: Owning handsome attributes like a kind, gentle smile, he is shown to be the eye-catcher of every woman in any gathering.
- Dark Is Not Evil: When he changes to Saya's side, he starts wearing all black instead.
- Heel–Face Turn: Though only out of love for Saya, as opposed to a change in morality.
- Humans Are the Real Monsters: Came to believe this after he was turned into a chiropteran, most likely also the reason he has no regard for human life.
- Light Is Not Good: Described to have the face of an angel and wears white to symbolize his devotion to Diva.
- Man in White: He is mostly seen wearing white suits. That is, until he decides to follow Saya and betray Diva, starting to wear black suits since then.
- The Medic: He used to be a military doctor before he turned into a chevalier.
- Only Sane Man: Compared to most of his brothers, Solomon is actually a pacifist.
- Parental Favoritism: According to James, he was "Diva's favorite boy."
- Undying Loyalty: Towards Diva. He later feels this way towards Saya, to the point where he betrays Diva (though he still admits he cares about her).
- War Is Hell: His experiences during World War I was one of his main reasons to become a chevalier, so he could be free from seeing humans kill each other, only to discover that chiropterans are just as bad.
- Worst Aid: After Saya pulls off a Deliberate Injury Gambit to kill Karl, Solomon stops her from pulling her katana out of her stomach, warning her that she could potentially damage her internal organs if she forces the blade out before quickly and cleanly yanking the sword out of Saya's body himself. If not for Saya's Healing Factor, she would have bled out right then and there.
Voiced by: Nozomu Sasaki (JP), Quinton Flynn (EN), Carlos Lladó (SP), Edson Matus (Latin-American SP)Karl Fei-Ong is one of Diva's wealthy chevaliers and her lover and a member of Cinq Flèches. He is the chairman of Lycee de Cinq Flèches, a renowned girls' high-school in Vietnam. He also has a second personality which is known as the Phantom.
- Alas, Poor Villain: In his final battle with Saya, Solomon appears and cuts his arm, leaving an opportunity to Saya to kill him by stabbing Karl through herself, crystallizing the Chevalier. Before dying, Karl asks Solomon why with the most betrayed tone possible. To make matters worse, Solomon is the only one of his brothers to understand his pain and miss him.
- An Arm and a Leg: He loses both an arm and a leg to Saya at different points.
- Ax-Crazy: When he is in his Phantom persona, he becomes mad and loses his sanity completely, apart of becoming extremely creepy while talking with someone (especially Saya).
- Camp: His flamboyant personality combined with his choices of attire.
- Death Seeker: Because of Diva's reject, Karl felt very lonely. For that, when he saw Saya's rampage in Vietnam, he fell in love with her and desired to die with her because he believed that Saya and him were solitary persons. Unfortunately for him, Saya didn't share the same belief.
- Dude Looks Like a Lady: He wears an ao dai, which isn't exclusively a woman's garment, but it's certainly most common.
- Faux Affably Evil: As the Chairman of Lycee, he's calm, polite, and well-mannered, but we all know that Beneath the Mask is a murderous, raving lunatic.
- Life-or-Limb Decision: He cut off his own arm and leg to avoid being crystallized by Saya's blood.
- Love Makes You Crazy: To Saya. And Diva, initially. The fact that she didn't love him is what drove him insane.
- Malevolent Masked Man: Stylized to look like bat wings.
- Playing with Syringes: Unlike his brothers, he was turned into a chevalier to be a test subject. He tells Saya that being a chevalier involved being vivisected repeatedly.
- Sanity Slippage: Before becoming a Chevalier, he was a sane and normal young man. However, after Amshel's experiments on him, he turned mad and obsessed with Diva (and later with Saya)
- Slasher Smile: Everytime he enter in his Phantom persona, he sports one of these.
- Taking You with Me: In his and Saya's final fight, he has Saya at his mercy and attempts to completely drain her of blood, knowing this would kill him as well, so they could die together. Saya doesn't go for it.
- Tragic Villain: Karl was made a chevalier against his will because Amshel wanted one to experiment on.
- Villain with Good Publicity: In his day job, he's the well-liked and respected Chairman of Le Lycee du Cinq Fleches, an all-girls Vietnamese high school.
Voiced by: Toru Okawa (JP), David Rasner (EN), Ángel del Río (SP), Óscar Gómez (Latin-American SP)James Ironside was Diva's sixth and last Chevalier and used to be her favorite. He was in contact with the US military and also the leader of Corpse Corps.
- Adaptational Wimp: In the anime, to defeat him, it took the combined efforts of Haji, Kai, David, Lewis, the Schiffs, Saya, and Solomon, and he was killed because the Thorn appeared in him in the perfect time to give Saya the chance to finish him, apart that he was overall one of the toughest opponent the Red Shield had to face through the series. In the manga, however, he is easily killed in his debut by Saya (in her Berserker mode), just before he was able to show his abilities.
- All There in the Manual: His past is never revealed in the anime, but in the official webpage of the series. Here, is revealed he grew out without a mother figure in his life, and eventually participated in World War II, where he was wounded to death and found by Diva, who turned him into one of his Chevaliers. He came to consider Diva the mother he never had, and is from there whom his loyalty towards her comes.
- Commanding Coolness: As a high ranking Naval officer, he is responsible for Cinq Flèches military contracts and later the leader of the Corpse Corps.
- Demoted to Extra: In the manga, he is killed by Saya in seconds just after appearing for the first time along with the other Diva's Chevaliers in the attack of the Red Shield HQ. Compare this with his role in the anime, where he is a powerful opponent and the Arc Villain during the London arc.
- Determinator: In his battle with the Red Shield in Christina Island, he was too focused on defeating Saya that after being wounded by her blood, he tries to take her with him to the hole with nuclear waste. Too bad that he did not expect Solomon...
- Irony: After an encounter with Saya leaves him fatally wounded and unable to regenerate, he's forced to get Schiff implants to stay alive. This means Diva loses interest in him for the same reason he scorned the Schiff.
- Instant Armor: His skin in Chiropteran form is tough enough to render swords and gunfire ineffectual.
- Lack of Empathy: Toward the Schiff. He even mocks Moses in front of Karman for agreeing to kill Kai for a cure for the Thorn.
- Karmic Death: Dies when he get's struck by the same disease as the Schiff he tried to slaughter.
- One-Man Army: He is one of the toughest opponents that the Red Shield have faced. It takes the efforts of Haji, Kai, David, Lewis, the Schiffs, Saya, and Solomon to defeat him. That still wasn't enough; if it weren't for the Thorn kicking in when it did, James would have killed them all.
- Sanity Slippage: After his battle with the Red Shield and the Schiffs on Christina Island, he is seriously wounded and Amshel replaces his missing parts with Schiff one, which makes Diva reject him. This affects him greatly and leaves him mad. When he confronts Karman about his opinion about the Schiff, he sports an incredibly disturbing smile while torturing him. Comparing this with his previous impeccable self, one realizes how much Diva's rejection has affected him.
- Tragic Bigot: His hatred of the Schiff, especially after Diva rejects him for having most of his body replaced with their parts.
- Tragic Villain: Perhaps the only one of Diva's chevaliers to be genuinely devoted to her, Diva casts him off when he's grafted with Schiff body parts following his first defeat by Saya.
- Undying Loyalty: To Diva, for saving him when he was about to die. He is so loyal to her, he goes insane when she rejects him after being implanted with Schiff's parts.
- Villainous Breakdown: Following his rejection by Diva.
Voiced by: Keiji Fujiwara (JP), Wally Wingert (EN), Carlos Lladó (SP), Alan Prieto (Latin-American SP)The chiropteran known as Nathan Mahler serves as Diva's chevalier, although it is kept a mystery whose Chevalier he actually is.
- Agent Peacock: From his voice to his demeanor to his hobbies he's a textbook case of Camp Gay but he's implied to be the most powerful of Diva's chevalier.
- Alas, Poor Villain: Subverted. He appeared to be rather satisfied with how everything turned out, and it's shown he survived.
- Beware the Nice Ones: Despite working for the villains, he's quite friendly. The few times he does threaten someone, it's freaking creepy.
- Blue and Orange Morality: Nathan couldn't care less about the ongoing conflict between humans and Chiropterans. His true motives aren't even mentioned until near the end and are cryptic even then.
- Crouching Moron, Hidden Badass: His gay mannerism and silly personality make him look like an idiot, but he is probably the strongest character of the series.
- Hidden Badass: Insinuates that he's not only stronger than James and Amshel but that he's the single most powerful being to appear in the show, period.
- Kiss of the Vampire: When Diva feeds on him, he goes on about how the sensation is "pure bliss."
- Mercy Kill: After seeing that Diva has died and lamenting on her own foolishness, he reverts to his Chiropteran form and gently asks Saya to kill him, since he would essentially be living an empty life of immortality. Saya grants his last wish... Although he's later seen to have survived the encounter and disguised himself as a reporter.
- Obfuscating Stupidity: Drops a hint that he was the chevalier of Diva and Saya's mother.
- Only Sane Man: He is the most calm of Diva's Chevaliers and the only one that never actively fights the Red Shield. Compared to Amshel, Karl or James, he is neither a fanatic or nor crazed.
- The Unfought: Nathan is the only Chevalier of Diva that never fight the Red Shield (except one time that he restrains Haji a bit). Not even in the ending of the series do we see him show his powers.
Voiced by: Junichi Suwabe (JP), Crispin Freeman (EN), Albert Roig (SP), Luis Daniel Ramírez (Latin-American SP)Van Argiano is the head scientist studying chiropterans for Cinq Flèches.
- Ambition Is Evil: The reason why he works with Amshel in his experiments is because he wants to become a successful scientist.
- Arc Villain: During the Okinawa arc, where he is the one pulling the strings through the events of the arc. He is then demoted as a subordinate of Diva's Chevaliers after that.
- Big Bad Wannabe: At the start of the anime one would think that he's the one behind the chiropterans' appearance. Promotional posters and images also help with this possibility. However, when Solomon and Karl appear in the Vietnam arc, one realizes that Van Argiano is not as big a threat as one would think before.
- Four Eyes, Zero Soul: Wears glasses and is capable of terrible and inmoral experiments on people to obtain his goals. Also he knows about Amshel's plan and doesn't do anything to stop him; in fact, he helps Amshel in its realization.
- French Jerk: He is from France and is a huge dick with his workers.
- Freudian Excuse: His background in the anime is not revealed, but in the official website it is revealed that he was the minor son in a French family who have seven children and that his older brothers bullied him.
- Genius Sweet Tooth: He is always eating candies, no matter in which situation.
- Karma Houdini: Subverted. He survived the chiropteran attack in the Metropolitan Opera House thanks to David, but the last time we see him he is about to be judged in a court for his crimes. Played straight in the manga, where he escapes the law successfully.
- My God, What Have I Done?: Van says this during the final confrontation, when he sees people turning into Chiropterans.
- Number Two: Become this to Amshel, due to Solomon's continuous absence in his work.
- Smug Snake: His treatment of his workers with condescension and irony make that the people around him dislikes him greatly.
- Starter Villain: He is the first member of Cinq Fleches to appear in the series and the one that causes the problems at the beginning of the series.
- The Unfought: From the moment he sees the first chiropteran that Saya kills in 2006, he mistakes her for a samurai and says many times during season 1 that he wishes to meet "that samurai". Except in the climax of season 1, when he briefly sees Saya fighting with Karl, he never meets or talks with Saya at all.
- Unwitting Pawn: He is this for Amshel. Argiano helps him in his experiments with the Delta 67, thinking that he eventually would be promoted to a better position in Cinq Fleches.
The SchiffA group of artificial chiropterans created by Amshel in a place called Khirbet with the purpose of create living weapons for the government of the United States. They are all sentient beings, and seeing that they would die enslaved if they stayed in the facility where they were created, they rebelled against their creators and escaped from Khirbet. Due to their defective bodies, they burn if they are exposed to the sun and develop a disease named "The Thorn" that appears gradually in their bodies and crystallizes them, resulting in their painful deaths. They interrogated a scientist on how to cure the Thorn and were told only Saya's blood can save them and so they attack her multiple times during the series.
- Anti-Villain: They are very violent and don't like humans very much, but they only kill to survive and not for pleasure. Also, while they try to kill Saya, it's also a matter of survival, nothing personal.
- Dark and Troubled Past: Spent most of their existence enslaved, created to be living weapons.
- Dark Is Not Evil: They start out as this, then gradually move to being characters of the light.
- Exotic Weapon Supremacy: Each Schiff has a unique weapon, some of which fall into this category—Moses' colossal, folding scythe for example, or Ghee's strange katar-looking handblade.
- Green Eyes: A trait they all share. In the case of Gudriff, he wears green sunglasses.
- Heel–Face Turn: Slowly start doing this once they realize, rather tragically, when Irène drinks some of Saya's blood and immediately and painfully dies, that Saya's blood is not in fact the key to curing them of their inevitable deaths.
- In the Hood: All of them wears black hood suits. Justified, as the contact with the sun burns them to the death if they expose much time to it.
- No Social Skills: Having been raised as living weapons, the concept of simply asking for something they want or for help rather than taking it by force is completely alien to them.
- Our Vampires Are Different: With their vulnerability to sunlight, they are the closest the series gets to conventional vampires.
- Pointy Ears
- Secret Project Refugee Family
- Super Soldiers: They are the result of Amshel's experiment to manufacture Chevalier, and despite not quite measuring up to the strength of the real thing, they're fast and powerful in their own right and have a similar regenerative ability.
Voiced by: Naoki Yanagi (JP), Steve Blum (EN), Carlos Lladó (SP), Ricardo Bautista (Latin-American SP)Moses, the leader of the Schiff, is the one who had encouraged them to leave the lab in Khilbet where they were created for the hope of freedom.
- Break the Badass: Goes through this over an episode or two once he realizes that Karman is dying.
- Despair Event Horizon: Finding out that Karman is about to die does not have any positive effect on Moses. Seriously.
- Driven to Suicide: When he realizes that he cannot save Karman from the Thorn, they both find a beautiful place, exchange some poignant dialogue, and watch the sunset until the sunlight overwhelms them and turns them to ash.
- Friendship Moment: With Karman just before they commit suicide.
- Heroic B.S.O.D.: Again, the knowledge of Karman's imminent death causes Moses to go through one of these.
- Meaningful Name: He inspired the Schiff to escape the research facility where they were created as test subjects.
- Peek-a-Bangs: His hair covers his left eye.
- Red Oni, Blue Oni: The blue to Karman's red.
- Ship Tease: He certainly gets extremely emotional once he learns that Karman is dying, especially when he understands the other plans to kill himself rather than slowly let the Thorn take him. Then he wants Karman to live so badly he actually tries to kill Kai, and probably would have succeeded if it weren't for Karman himself interfering in the nick of time. And the fact that he'd rather kill himself along with Karman rather than live for a little longer with Lulu speaks for itself.
- Sinister Scythe: Moses uses a scythe as his weapon.
- Vitriolic Best Buds: With Karman.
Voiced by: Kenji Nojima (JP), Dave Wittenberg (EN), Ángel del Río (SP), Roberto Mendiola (Latin-American SP)Karman is one of the schiffs hunting down Saya in order to survive.
- Break the Badass: Has this done to him by James Ironside, and boy does it hurt.
- Driven to Suicide: When he contracts the Thorn, he plans to do this, but Moses manages to stop him—though only for a short while. As soon as Karman makes Moses realize he can't be saved, they both find a beautiful place, exchange some poignant dialogue, and watch the sunset until the sunlight overwhelms them and turns them to ash.
- Friendship Moment: With Moses just before they commit suicide.
- The Glasses Come Off: Averted. Karman has his glasses on in every fight he participates in.
- Jerk with a Heart of Gold: Despite acting like a jerkass towards most of the people he meets, he seems to genuinely care about his fellow Schiff.
- Red Oni, Blue Oni: The red to Moses's blue.
- Vitriolic Best Buds: With Moses.
Voiced by: Chiwa Saito (JP), Lara Jill Miller (EN), Mar Nicolás (SP), Ana Lucía Ramos (Latin-American SP)Lulu is the youngest Schiff member.
- An Axe to Grind: She carries a battle axe for a weapon.
- Bittersweet Ending: After enduring all of the struggles and losses she and her band of fellow Schiff went through, she ends up being the Last of Her Kind. On the bright side, she's finally got to see Okinawa and receives medical treatment from Julia to ward off the Thorn.
- Earn Your Happy Ending: Despite losing all her Schiffs friends, at the end of the series Julia finds a way to extend her life and she is able to go to Okinawa, with new friends that care for her.
- Genki Girl: Very energetic and cheerful, especially comparing to his fellows Schiff, who are embittered, cynic or sad..
- Last of Her Kind: She is the only one of the Schiff that survives to the end of the series.
- You Gotta Have Blue Hair: Her hair is pink and probably is the one who have the most exotic hair color of the series.
Voiced by: Megumi Toyoguchi (JP), Olivia Hack (EN), Ariadna Jiménez (SP), Marisol Romero (Latin-American SP)Irène is one of the Schiff, created from Diva's blood.
- BFS: Her weapon is a very big sword.
- Cruel and Unusual Death: Unlike the other Schiffs, who either were killed or committed suicide, she dies from the Thorn when she drinks Saya's blood, suffering a painful death.
- Dirty Business: Irene admits to both Ghee and Kai that she does not want to kill anyone anymore, despite having little choice in the matter.
- Hair of Gold, Heart of Gold: Blonde and the nicest of the Schiffs. She also didn't try to harm humans (even in self defense and when she is hungry) and was very grateful to Kai when he saves her of a thugs in Paris.
- Hyper Awareness: Irene is the only one of the Schiff who possesses this ability, being able to sense any target within a fairly wide distance of herself.
- Meaningful Name: Her name comes from the greek word "Ειρἠνη" (Eirene) who means "peace". She is also the most peaceful of the Schiffs.
- Mr. Exposition: When Kai saves her and ask her about the Schiffs's origins, she tells him all their story of their creation, about the Thorn and why they pursue Saya.
- Nice Girl: So nice that is incapable of attack people in fear that her Chiropteran instinct take her. She also assists a kid when he is hurt and don't sees humans as evil beings, unlike her teammates.
- Reluctant Warrior: She doesn't like to kill other beings, so she always tries to avoid fighting, even when she could defeat and kill her opponents.
- Sacrificial Lion: Her death, while dramatic and sad, is the thing that put an end to the Red Shield and the Schiff's disputes. It also confirmed that Saya's blood isn't the one that the Schiff needs and later the reason why the Schiffs helps Saya.
Voiced by: Jun Fukuyama (JP) Kamali Minter (EN), Héctor Emmanuel Gómez(Latin-American SP)One of the Schiffs.
- Sacrificial Lamb: To the Schiff. He drinks Haji's blood and starts to crystallize, but not before revealing to his teammates that a Chevalier's Blood isn't capable of saving them.
A member of the Schiffs.
Voiced by: Koji Yusa (JP)A member of the Schiffs.
Voiced by: Mai Kadowaki (JP), Amber Hood (EN), Georgina Sánchez (Latin-American SP)Saya's best friend.
Voiced by: Mai Kadowaki (JP), Lara Jill Miller (EN), Creator/Liliana Barba (Latin-American SP)Min is Saya's roommate, classmate and best friend in Vietnam.
- What Happened to the Mouse?: After the last time she sees Saya with her dress ripped leaving her in the lyceum, she never appears again.
Voiced by: Risa Suzuki (JP), Janice Kawaye (EN)Mui is a young handicapped Vietnamese girl who becomes Riku's friend when they meet in Vietnam during Saya's investigation there.
- Tragic Monster: After forming a friendship with Riku, she is tragically turned into a Chiropteran, causing him to promise her, in her mindless, monstrous form, that he will find her a cure.