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Tera Guardian: Kuro
- Beam Spam: His Thousand in a nutshell. It allows him to fire lasers individually, or all at once. When he uses it against Nanase, it even takes the form of a wave motion cannon!
- Cartwright Curse: Nearly all the people he cares about die on him, including his mother, his classmate, Lisa, and his neighbor's daughter, Mayu. Especially poor Mayu....
- Character Development: More pronounced in the manga, where he went from a Jerkass to genuinely wanting to help and protect Kuro. However, it takes a long, rocky road and multiple brushes with his mortality to gradually make that path. It's still there in the anime, but he starts off as a notably nicer person by comparison.
- Determinator: Is he ever!
- Keita survived having his terra drained, by Nanase, in order to get to Kuro. When Nanase catches up to to him, she smashes his skull with a rock, and drains what little terra he had left, while giving him a Motive Rant. Keita uses what little strength he has left to wrap his legs around her neck and slam her into the rocks, knocking her unconscious, so he can finally sync with Kuro, against Hiyou. Keita's desire to protect Kuro deepened their bond to such an extent that they both gained dual crests!
- Died Happily Ever After: At the end of the anime, having lived the rich full life Kuro wanted for him. As a show of gratitude, he takes the curse of the Doppeliner System with him.
- Heroic RRoD: Keita collapses twice, at different points, due to the excessive strain syncing puts on him, because he's a Sub. Which is part of the reason Kuro leaves him in the end.
- Jerk with a Heart of Gold: Although he can be a jerk to his friends, he's actually a good-natured person. In the anime adaptation, where it's revealed he acts this way and pretends to be a jerk in an effort to keep others from getting close to him, due to his Cartwright Curse.
- Literal Change of Heart: His heart gets swapped by Kuro in order to rescue him.
- Non-Action Guy: Keita fits the description, 'til after their fight with Excel and Steiner. Before Keita, Akane, and Kuro leave for Okinawa, Excel gives him a Thousand to use in battle.
- Ridiculously Average Guy: Keita isn't some brawler, martial artist or even a truly special person. His gramps is pure Badass Normal, Akane is a powerful True Root in the long-term, and Kuro has to protect him far more than he can her, though he does gradually learn to use his tera to be a solid partner for her. He's not even a Root, but a Sub that ends up having to Screw Destiny thanks to Kuro to survive, yet is far from an optimal Contractor for her as a result.
- Someone Else's Problem: Starts off thinking this way, in regard to his pact with Kuro. That is, until Excel and, much later, Shingo set him straight.
- Supporting Protagonist: Alongside Kuro.
- The Unchosen One: It's by pure coincidence and Kuro's kindness that he ends up becoming a Contractor for her, and in the long term this gives them a hell of a lot of hardship. And unlike some examples, this does get to him on various occasions. But he sees it through to the end.
- We Used to Be Friends: Keita chews Daichi out royally, when he realizes what his real intentions are.
- You Killed My Father: Toward Nanase, when he finds out she purposely killed his mother, in order to sustain her own existence.
- Your Days Are Numbered: Had he continued to synchronize with Kuro for much longer, the strain would have eventually killed him.
Contractee: Keita Ibuki
- Action Girl: She often has to defend herself as she's a target of the Kaionji Group, and Hiyou.
- Apologizes a Lot: Regardless whether she's at fault, or not.
- Apocalypse Maiden: It's eventually revealed that she's the reincarnation of third member of the Masagami, who cursed the world with the Doppeliner System.
- Badass Adorable: She can kick ass despite being a friendly, cute girl.
- Big Eater: Which isn't helped by the fact Punipuni often swipes whatever food she manages to get ahold of.
- Boxing Battler: She is often frowned upon for using boxing, a human fighting style, when she fights. Doesn't stop her from usually winning. This is changed in the anime to her being more of a Bare-Fisted Monk.
- Cute Bruiser: She may be beautiful, but she can hold her own against enemies.
- Calling Your Attacks: Once she learns how to use her Exceed. From then on, expect to hear: "Exceed... Mega EXE!!" at least once, or twice, per battle.
- Does Not Like Shoes: She primarily goes barefoot in the anime version.
- Genki Girl: With all the crap she has to put with, you'll wonder how she does it. At least, until Keita tells her that she doesn't have to hide her pain anymore, and says it's okay for her to cry. Then the dam breaks.
- Going Commando: Thanks to being a Nubile Savage and spoiled princess, Kuro has no idea what underwear even is. At least a couple cases have her wearing shorts and certain other clothes at the behest of Akane, but usually she wears no panties or the like whatsoever.
- I Want My Beloved to Be Happy: She comes to realize that the Doppleliner System would remain in effect, as long as she and Keita are bonded to each other. In the end, she parts ways with him and returns to The Pure Place, where she remains 'til the end of her days.
- Lethal Chef: It's not so much that she cooks poorly, as it is that with everyone understanding she has No Social Skills, even Nam would sooner knock the poor girl out than dare let her attempt to cook and probably burn the house down.
- Literal Change of Heart: In the anime version, by swapping hers with Keita's, in order to save his life.
- Near-Rape Experience: Hiyou finally gets her alone and was moments away from doing this, when Keita arrives.
- No Indoor Voice: Because she's so hyper. Keita and Akane usually have to tell her to tone it down, which she finally does.
- No Social Skills: No surprise, given she's had no exposure to the outside world, 'til now.
- Nubile Savage: Her initial appearance gives this impression, but she's actually a Tomboy Princess.
- Pint-Sized Powerhouse: Not relying on Waif-Fu, Kuro can hold her own and even mop the floor with guys better than twice her size.
- Royals Who Actually Do Something: She's the princess of the Shinshingami Clan, and is devoted to restoring balance to the Doppeliner System... until she learns thet truth about it.
- She's Got Legs: A perfect pair to kick ass with.
- SI Prefix Name: Her Signature Attack is tiered by SI prefixes: Mega-Exe, Giga-Exe, and Tera-Exe. The last one requires combining the powers of the three main characters.
- Tomato in the Mirror: When she finally realizes she's the reincarnation of one of the Masagami.
- Tomboy Princess: Hiyou refers to her as such, right before attempting to rape her.
- Childhood Friends: With Keita. She's old enough to be his big sister, but she's secretly in love with him.
- Clingy Jealous Girl: Akane gets the wrong idea when Kuro tries to sleep in the same bed as Keita, to deepen their synchronization, and stays overnight to keep anything from happening. She has another bout of jealousy after seeing Excel kiss Keita.
- Cute Clumsy Girl: Her blouse gets caught on her locker, in the first episode, which exposes her cleavage. Also see the Running Gag entry below.
- FaceHeel Turn: Subverted. It initially appears this way when Keita and Kuro learn sshe's become Reishin's Contractee. It's eventually revealed she was trying to help Reishin to rid the world of the Masagami and the Doppeliner System.
- Feminine Women Can Cook: She takes it upin herself to prepare meals for Keita ever since his mom died, and because she has feelings for him.
- Friend to All Living Things: Including Yuki, when Daichi tries to kill her; despite the fact Yuki had threatened to kill Akane with the very same gun, only moments prior.
- Like Brother and Sister: Kuro even mistook her for Keita's sister at first.
- Messianic Archetype: She takes in Kuro and feeds her, after finding her passed out near Keita's apartment. And as seen above, she even shielded Yuki to keep Daichi from killing her. Akane even goes so far as to become Reishin's Contractee in order to help rid the world of the Masagami and the Doppeliner System.
- Rapunzel Hair: Not as long as Riona's, but still very long.
- Running Gag: Her habit of absentmindedly pouring too much tea whenever she's put on the spot about her feelings for Keita.
- The Chosen One: Was foretold to be a True Root, whose tera would exceed all others. Making her the only one capable of using the Thousand Reishin gives her.
- Victorious Childhood Friend: She marries Keita in the final episode of the anime.
Kuro's pet dog.
- Big Eater: Punipuni spends half his time either swiping food from Kuro's plate, or snatching it from her hand.
- Repetitive Name: Punipuni.
- Team Pet: He and Kuro are inseparable.
Tera Guardian: Steiner, Mikami
- An Arm and a Leg: After Steiner's death in the failed battle with Reishin, Excel loses her left leg, which leaves her paraplegic. She gets a prosthetic after a while.
- Attack Reflector: By the third time she fights Reishin, she's improved it so it can absorb enemy attacks and redirect them back at the target.
- Barrier Warrior: Her Thousand's special ability: Hexa Wall. Later, she improves with it enough that she can project it anywhere on the field, and even project multiple barriers at once.
- Beat Them at Their Own Game: Her improved Hexa Wall surrounds the target on all sides to draw all fire from any direction. Then redirects it back at the target in an omni-directional barrage.
- Deadpan Snarker: In regards to Kuro's lack of understanding as a Tera Guardian, and Keita's failure to grasp what it means to be a Contractee. So she and Steiner had to explain it to them.
- Death Seeker: She becomes one, after Steiner's death. Mikami calls her out on it, right as they prepare to face Reshin.
- Elegant Gothic Lolita: Dresses in a black and white Victorian style attire.
- Emotionless Girl: Eventually subverted after Steiner dies.
- Huge Guy, Tiny Girl: She's just under 5' ft, which makes her look tiny next to Steiner.
- Laser-Guided Amnesia: After being traumatized by Steiner's death and suffering near-fatal wounds, Excel temporarily loses all memory of herself and ends up being taken care of by Mikami in the duration. It takes Mikami about to be tortured in a helpless fight for her to regain her memory - and be Mikami's new contractor.
- Not So Stoic: She has an emotional breakdown when Steiner dies.
- Older Than They Look: Excel may look like a child, but she isn't.
- Really 700 Years Old: The extra episode shows that she is around 100 years old.
- The Strategist: Covered in the Barrier Maiden entries.
- Survivor Guilt: She was, by all means, about to officially marry Steiner once and for all after being with him for so long. Then he died, turning her into a Death Seeker hoping to reunite with him.
- Weak, but Skilled: Also covered by the Barrier Maiden related entries.
- What the Hell, Hero?: At her own organization when they back off from the Kaionji case after Steiner dies.
- Badass Longcoat: As in, black leather.
- Big Damn Heroes: When he saves Akane from nearly being run over by a Tribal End. Also a literal example, given he's over 6' ft tall.
- The Big Guy: Steiner's over 6' ft of solid muscle, and don't think for a second that it slows him down.
- Blood Knight: Before he and Reishin begin their duel, Steiner admits relishing the opportunity, since it would allow him to finally fight without having to hold back.
- Defeat Means Respect: Reishin expresses his heartfelt admiration of Steiner's commitment to his duty as a Terra Guardian, after killing him.
- Duel to the Death: At the end of his duel with Reishin.
- Huge Guy, Tiny Girl: Compared to Excel and pretty much anyone else, for that matter.
- Lightning Bruiser: Especially when he's using his Exceed, which allows him to move so fast he creates an army of clones.
- The Men in Black: The standard attire of The Noble Ones.
- One-Man Army: A quite literal example, as Steiner's "Stampede" ability allows him to move fast enough to create an army of speed clones that can attack autonomously. Including individually, in groups, or all at once!
- Undying Loyalty: To Excel. So much that he had one of his Stampede Copies carry her to safety, right before he died.
- The Worf Effect: Made out to be a badass and overall far more efficient Guardian-and-Contractor pairing compared to newbies Keita and Kuro, with upwards to a century of experience. He then dies to Reishin in what turns out to be an insanely one-sided battle, and for insult to injury Reishin didn't even have to Synchro.
Contractee: Riona Kogure
- Almighty Janitor: Despite lacking the power of the other Tera Guardians, he's such an exceptional hand-to-hand combatant that was appointed to be Kuro's personal bodyguard. It's also rare to see him use his Exceed, as he's able to curbstomp several Tribal Ends at once in Bullet Time.
- Braids, Beads and Buckskins: His attire loosely resembles Native American garb, including the feathered hair clip he wears.
- Cowardly Lion: Yakumo would much rather run, than fight, if he can help it. Even though he's capable of curbstomping Tribal Ends.
- Declaration of Protection: Toward Kuro, since it's his sworn duty to protect the princess of the Shinshingami Clan, and toward Riona, who's his Contractee.
- I Can Still Fight!: He'll often insist this, even when he's clearly injured and in need of care.
- Let's Get Dangerous!: Yakumo's a bit of a slacker and would rather not fight... unless he has to. Such as when anyone threatens either Riona, or Kuro while he's around.
- Martial Pacifist: Unlike other Tera Guardians, Yakumo prefers not to fight and will go to great lengths to avoid doing so, unless it absolutely cannot be helped.
- Nice Guy: Yakumo's defining characteristics are his humility and patience toward Riona and Kuro.
- Platonic Life-Partners: It's implied that Riona may have feelings for him, but nothing ever comes of it. They part as friends during the final episode.
- Weak, but Skilled: Yakumo isn't as strong as most other Tera Guardians, but is so proficient in martial arts, that he rarely needs his to use his Exceed. In fact, he's only forced to use it three times!
- Well, Excuse Me, Princess!: Double subverted, since Kuro never complains about him, and he realizes Riona's griping stems from concern about his well being.
Tera Guardian: Yakumo
- Big Eater: She's constantly eating some sort of junk food.
- Genki Girl: She's pretty upbeat, considering the type of situation she and Yakumo are in. Then again she...
- Jumped at the Call: After learning about the Doppleliner System and finding out she was a Main Root, she voluntarily became Yakumo's Contractee, in order to protect herself.
- Hollywood Nerd: She usually wears her school uniform and a frumpy looking jacket, but she's pretty cute and, if her synchro sequence is any indication, she's got a bangin' bod.
- Mega Nekko: Part of her Hollywood Nerd image.
- Platonic Life-Partners: With Yakumo. Though it's implied she may have had feelings for him when he parts ways with her, at the end of the anime version.
- Rapunzel Hair: Her hair extends well past her waist, despite wearing it in a ponytail.
- Screw This, I'm Outta Here!: She fled the Kaionji Group once she learned they were planning to experiment on her, because she's a Main Root. Which is also the reason she made a pact with Yakumo.
- Pretty Freeloader: She feels this way about Nam, since Nam's always mooching of her, yet she never seems willing to help them. Nam eventually makes up for it, but runs off with her snacks in the end!
- Tsundere: Type B, for the most part. She only chews Yakumo out when she's worried about him.
- You Gotta Have Blue Hair: Cerulean blue.
Contractee: Shingo, Excel
- Blood Knight: She and Shingo used to enjoy battling together to showoff their might. At least, until it started to take a toll on Shingo's health, because he was a Sub.
- Boobs of Steel: She has one of the biggest busts in the cast and the power that comes with it.
- Combat Stilettos: Of the high heeled variety.
- Consummate Professional: She's very businesslike, when accepting assignments. But the way she carries out those assignments is pretty brutal.
- Cool Shades: Usaually worn while discussing business, or accepting job offers.
- Death Seeker: Mikami recognized it in Excel, because she had become one herself, after Shingo died.
- Fiery Redhead: Mainly when she's fighting, otherwise, she's pretty reserved.
- Ms. Fanservice: Not a fight goes by without emphasizing her Boobs of Steel or her figure.
- No-Holds-Barred Beatdown: Her Exceed boils down to pinning her opponent and beating the sh*t out of them, UFC style.
- Please Don't Leave Me: Has a heartwrenching one when Shingo dies, due to the strain from synchronizing with her, because he was a Sub.
Mikami: (tearfully) "I'm sorry, Shingo... This wasn't stylish at all.
- Professional Killer: Hiyou usually hires her to take out Tribal Ends, that have failed him.
- Big Brother Mentor: Gender-flipped example. In the manga, Nam becomes this for Kuro and Keita. At first, she kept her distance unless directly threatened, but when she learned of Kuro's circumstances, among other things, she began to play a more active role in the group dynamics.
- Big Eater: Moreso than Kuro, much to Riona's chagrin. As shown in the manga, she'll even take time to snack while fighting 40+ Tribal Ends.
- BFS: She uses a type of Korean sword that also functions as her 'Thousand'.
- Boobs of Steel: Hers are even bigger than Akane's and Mikami's. She's also an order of magnitude more powerful than Kuro and Keita (and many other Tera Guardians/Contractors) synchronized. Nearly everyone who's taken her on has been handed their asses by her, collectively or otherwise.
- Clap Your Hands If You Believe: Manga only. The reason she came to Japan in the first place was to get onto a TV show so she could enough money to rebuild and fund a temple to her own country's Shinryon (Tera Guardians).
- Deadpan Snarker: When Riona asks Nam why she doesn't help them, Nam snarkily replies that a scribe's job is to record history, not make history.
- Erotic Eating: She's often seen with bananas and such in her mouth.
- Flash Step: In the manga, she is so fast, she can create one hundred speed clones as a diversion.
- Katanas Are Just Better: Nam's weapon of choice is a sword called a hosindo changpogeom, a concealed sword .
- Our Elves Are Different: In the manga, she is similar to the Motosumitama in that they both considered Terra Guardians but Nam doesn't need to form a Contract with a human and is actually considered a minor deity in her own right with enough power to perform exorcisms.
- Pretty Freeloader: From Riona's point of view, since all Nam does is follow them around and mooch off of her. Yet, Nam never wants to help out, 'cuz she's a scribe. She protects Riona several times, during the battle with the Masagami, but she runs off with her snacks at the end! She acts like this at first in the manga but she actually pulls her own weight and even helps to train Kuro and Keita in how to properly synchronize.
- So Long, Suckers!: She pulls this on Riona, at the end, by swiping her bag of snacks, as payment for services rendered, and runs off with it!
- Someone Else's Problem: At first anyway. But, as seen by the Pretty Freeloader entry, she finally lends a hand when it counts, by saving Riona's life twice.
- A God I Am Not: When the Masagami ask if he's a god, for defying them, Reishin answers "no." Then tells them they aren't gods either.
- Big Bad: The main antagonist for much of the series, until it's revealed that he's actually a Well-Intentioned Extremist.
- Big Brother Instinct: Anime version - You have to give respect to a guy who's willing to slaughter members of his own tribe and family to save his little sister from being executed on her birthday. And knock the natural balance of the entire planet off kilter just for the chance to kill the dark god partially reincarnated as his sister in order to save her (and all life as we know it). Additional awesomeness being voiced by both Katsuyuki Konishi in Japanese AND Crispin Freeman in English.
- The Coats Are Off: ...and that's when shit gets real. Ask Kuro and Steiner.
- Curbstomp Battle: See Hero Killer and Invincible Villain below, 'nuff said.
- The Dreaded: Everyone fears him for good reason.
- The Extremist Was Right: Ultimately, his plan succeeds, allowing for the destruction of the Doppeliner System as a bonus.
- Hero Killer: Reishin kills Steiner, Bernhart, and dozens of others, mops the floor with Kuro twice, and easily repels/survives even the strongest Exceed abilities. The only ones to actually make him work for a win were Steiner, Kuro (during their final battle), and the Masagami.
- Invincible Villain: Reishin straddles the line between this trope and being an Implacable Man. Bottom line: anyone who tries to fight him is going to lose... Badly.
- Not What It Looks Like: It is actually the elders who killed the innocent people trying to protect Kuro, not him. Yakumo only saw the aftermath that made it looked like he killed everyone.
- No Kill Like Overkill: Reishin's Exceed: Tera Cannon. Picture a ring of glowing orbs surrounding the target, then all of them going off simultaneously in the form of massive ki blasts that solidify as they impale the victim from every angle, in a 360º radius.
- Power Echoes: Whenever he uses his Exceed ability.
- Redemption Equals Death: In the anime version, Reishin dies while attempting to kill the Masagami to save Kuro, and the rest of mankind. It came back, stronger than ever.
- Self-Made Orphan: With much reluctance... and remorse.
- Sharp-Dressed Man: He dresses this way, while working with the Kaionji Group.
- Well-Intentioned Extremist: Everything he did in the anime was part of [[spoiler:a scheme to both save his sister and permanently end the Masagami's threat to the world.
Daichi Kuraki Shun Sawamura
Tera Guardian: Raiga
- Big Bad Friend: Daichi is Keita's former best friend, who believed him to be dead.
- Dead Person Impersonation: Shun takes the place of one of his Subs, Daichi, who commited suicide. Since they looked identical, no one questioned it.
- Dirty Coward: How does he eliminate Hiyou and Reishin? By waiting 'til they were both powerless from fighting Kuro (in Hiyou's case) and Steiner in the latter's case. Then he talks smack.
- The Cracker: A textbook example. Daichi is often shown in his dark room watching an array of monitors, keeping tabs of various people he intends to use, or manipulate, to suit his ends.
- The Dragon: He's Hiyou's second in command, but he eventually betrays the latter.
- Gadgeteer Genius: Daichi manufactures replica Thousands for his followers to use, which generate force shields.
- I Shall Taunt You: Daichi loves talking down to those he feels are beneath him, and those he's betrayed. He even ridicules Hiyou and Reishin to their faces... once they're powerless, of course. Then has Raiga kill the former, and arranged to have the latter banished through a wormhole.
- Jerkass: Smug, snide, condescending, self-important... you name it. It's no wonder he didn't have any friends, not that he was trying to make any.
- Klingon Promotion: First he gets rid of Hiyou, then does the same to Reishin, so he can marry into the Kaionji Family and become it's new CEO.
- Manipulative Bastard: Covered in all of the Jerkass entries, and the preceding one.
- Smug Snake: Talks plenty of sh*t, when he takes advantage of Hiyou, who was left weakened from his battle with Kuro. And does the same to Reishin, by waiting 'til he's too exhausted from having fought Steiner to defend himself. Which is when he has Raiga impale him, to use Reishin's tera to empower his followers, all while taunting him.
- Utopia Justifies the Means: It's his justification for all the lives he's ruined and taken, but Keita sees through Daichi's bullshit and calls him on it.
- What Measure Is a Mook?: For all his talks about peace and equality for Roots and Subs, Daichi doesn't give two sh*ts about Subs. Once he gets Reishin out of his way, he mocks Yuki for being a Sub, in one of the cruelest "reason you suck" speeches ever.
- Well-Intentioned Extremist: What he believes himself to be, but it's ultimately subverted when Keita makes him realize he was doing it for himself, rather than the good of others.
- You Have Outlived Your Usefulness: Pulls this on Hiyou when he betrays him and has him killed, by Raiga.
- Because You Were Nice to Me: Akane's act of selflessness causes Yuki to have a change of heart.
- Broken Bird: She gradually slips into this role as the series progresses, due the shame of being a Sub, while the rest of her family are Master Roots.
- HeelFace Turn: As a result meeting finally meeting Akane, and the latter saving her life at personal risk to her own.
- I Just Want to Be Loved: She desperately wants to become a Master Root, like her siblings, since they all look down on her. She also feels it's the only way she'll ever gain her father's acceptance.
- I Just Want to Be Special: She also hates being treated like less than a person, simply because she's a Sub.
- Hellish Copter: The Doppeliner System strikes again.
- Murder the Hypotenuse: Once Yuki learns that Daichi's been harboring Akane in the penthouse suite of the Kaionji Building, she confronts Akane with the intent to kill her, even if it meant becoming a Negative Root. But she couldn't go through with it.
- Redemption Equals Death: A tragic case, since you can't help feeling for her, after all the crap she took from her family and Daichi.
- Rich Bitch/The Ojou: She comes across this way for much of the series. There's a reason for that.
- The Unfavorite: She's the only one of her father's children to not be Master Root. She's a Sub. Three guesses what they think of her.
- Unwitting Pawn: To Daichi, who she thought was helping her. Instead, he was planning to kill her once he found her other Sub, and Akane, who's their Main Root. Which would have made Akane a Master Root. So he thought.
Voiced by: Eiji Miyashita (JP), Matt Caplan (EN)
Contractee: Daichi Kuraki
- The Dragon: He's Daichi second in command.
- nTheBack: Not exactly in the back, but right when Reishin was weakened.
- It's Personal: Against Reishin, for ordering the slaughter of the Hima Clan.
- Kick the Son of a Bitch: Daichi has him kill Hiyou, by draining his tera.
- Last of His Kind: At first, he shares this spot with Kakuma and Makana, until he sacrifices Kakuma, in order to break the seal on The Pure Place. After he's killed, by Kuro, Makana is left as the last surviving member of the Hima Clan.
- Revenge: Raiga wants avenge the Hima Clan of Tera Guardians, who were nearly wiped out under Reishin's orders.
- Silent Bob: Until he's face-to-face with Reishin, that is. Then he tells him exactly what he thinks of him.
Tera Guardian: Hiyou
- Bitch in Sheep's Clothing: When she first approaches Keita, she pretends to sympathetize with him over the loss of his mother. She drops the act once he lets his guard down, and steals his tera, so he couldn't help Kuro.
- Evil Twin: Nanase was one of his mother's Subs, until she killed the other two to change her fate.
- Hot Consort: A flashback reveals she's slept with Hiyou though, judging from her sullen expression, it seems she did it reluctantly.
- I Did What I Had to Do: Delivered via a Motive Rant, while draining Keita's tera.
- Murder the Hypotenuse: She murdered Keita's mother.
- Screw Destiny: After learning she was a Sub and doomed to a short and unhappy life, she defied the Doppeliner System by killing her Root — Keita's mother — and her other Sub, thus becoming a Negative Root.
- Tears of Remorse: Not for the things she'd done, but because she had never known what it was like to feel happiness before dying.
- Woobie, Destroyer of Worlds: Since she's a Negative Root, she has to sustain her existence by siphoning the tera of others. But it doesn't bring her the fulfillment she desires. Instead, it only adds to her misery.
- You Killed My Father: [[spoiler:She is the one who killed Keita's mother.
- Your Soul is Mine!: It's the only way she can keep herself alive.
Contractee: Nanase Shinobu
- Attempted Rape: Narrowly averted by Kuro's defiance, and Keita's timely arrival.
- Bad Boss: This is part of what causes Daichi to turn on him.
- Blood Lust: It's the reason he fights, since it gives him an excuse to maim and torture his victims.
- Combat Sadomasochist: While most Tera Guardians are BloodKnights, save for Yakumo, Hiyou gets off on torture.
- Jerkass: He's a sadistic and callous jerk.
- Karmic Death: Daichi finds him weakened after he was defeated, by Kuro, and takes advantage of the situation by placing Hiyou in the very device he used to kill countless other Tera Guardians. Then has Raiga do the honors.
- Making a Splash: His Exceed allows him to manipulate water by firing needle-like projectiles of it at his opponent. Or, he can turn it into shards of ice. And what's really scary is, he can also use it to manipulate the water in his victim's blood, though it requires him to make physical contact with their bodies.
- Shoot the Messenger: He vents his frustration at having lost to Kuro and Keita, by killing one of his Tribal Ends when they tried to relay a message from Daichi. Hiyou didn't even care what the message was about.
- Slasher Smile: Damn near constantly... unless he's pissed.
- Smug Snake: Hiyou thinks he's big time, but fails to notice he's being played by Daichi, 'til it's too late.
- You Have Outlived Your Usefulness: After invoking this several times, he ends up being a victim of it, himself.
- A God Am I: They view themselves as an everlasting god.
- Apocalypse Maiden: At their full power, they can bring about the end of the world. And they came pretty close to doing it.
- Dual Boss: In both its subforms and its One-Winged Angel form.
- Eldritch Abomination: Once they've gone One-Winged Angel. They even speak with Voice of the Legion.
- Final Boss: It takes Reishin to defeat it the first two times, and Kuro's TERA EXE to defeat the final time.
- Fire, Ice, Lightning: It has the powers of all three of its subforms combined, albeit with FAR greater tera.
- Fusion Dance: In order to survive Reishin's Tera Cannon, the remnants of the Masagami fuse together.
- Greater-Scope Villain: Just when you thought there couldn't be anything worse than Reishin, the Masagami is the true main antagonist of the series.
- Hot as Hell: To say it's an Eldritch Abomination that's half fire/half ice, with horns and Prehensile Hair, it's got a smokin' bod. It's even beautiful, in a deadpan sort of way.
- It's Got Legs: Which should come as no surprise, given it's an evil version of Kuro.
- Leotard of Power: It shows plenty of skin for something that's hellbent on the world's destruction.
- One-Winged Angel: After Reishin defeat them for the second time.
- Prehensile Hair: It uses it to slam Kuro around like a ragdoll, then tries steal her tera.
- Sealed Evil in a Can: Until Reishin destroyed all of the Tera Stones.]]
- Voice of the Legion: They have very odd voice that not only reverbs and echoes, but also switch between female and male voices. Much like The Beast in Homeworld Cataclysm.
- It appears like they have 5 different voices (3 female voices and 2 male voices)
- Walking Spoiler: As you can "see".