Nickname: Sword Eater
- Affably Evil: While he may be villainous to the point that he injured Kaito, he considers Ikki a Worthy Opponent.
- Blood Knight: Always tries to provoke strong people into fighting him. He will break the law to do so.
- Boxing Lessons for Superman: After losing to Ikki, Kuraudo learns Ayatsuji style swordsmanship from Kaito, which has great synergy with Marginal Counter.
- Character Development: Ikki notes that Kuraudo couldn't possibly change his device's form so drastically without similarly drastic changes to his philosophy and lifestyle. Indeed, Kuraudo only respected swordsmen when they were strong opponents, but he didn't care at all about the discipline or finesse involved when he could just get by with brute force and superior reflexes, which is reflected in his delinquent and dojo-busting lifestyle. After being humbled by Ikki's use of Ten'i Muhou, he decides to take swordsmanship seriously to the point of learning from the dojo that he once mocked. While he's still very rude, Ikki notes that he's actually less of a delinquent than before due to all the training he went through.
- Dual Wielding: He changes from using a single bone-whip sword to wielding two smaller ones. This is somewhat deconstructed because wielding both swords requires more mental effort than just one.
- Easily Forgiven: Subverted. Kaito had to train him in secret because Ayase hasn't forgiven him for putting her father in a coma.
- Expy: Many fans note a great many similarities between him and Renji from Bleach.
- Graceful Loser: Downplayed. He clearly respects Ikki for defeating him, but he admits that he can't let the loss go, causing Kuraudo to go as far as to abandon his previous brute-force style.
- Hero Killer: He hospitalized Kaito Ayatsuji, who is known for defeating Blazers despite being a normal human.
- Jerkass: He goes to extremes to anger strong people in order to get a good fight and isn't afraid to hospitalize them. While he does display some noble traits, he's still far from qualifying for a heart of gold.
- Hope Spot: He manages to beat one Ikki clone with his improved swordsmanship and thinks he has a shot at beating Sara, but the other two overwhelm him.
- Noble Demon: At the same time, he some respect for his opponents, such as when he takes Ikki's reproduction of Kaito's technique head on, regardless if he could have won by fighting more cautiously.
- Repetitive Name: Kuraudo Kurashiki
- Spam Attack: With his Marginal Counter he can strike multiple times in rapid succession.
- Super Reflexes: He has an ability called Marginal Counter that gives him insane reflexes in exchange for his stamina.
- Unskilled, but Strong: His actual sword technique is not that good, but his reflexes make up for it. Downplayed when he realizes that reflexes alone aren't enough against sufficiently skilled swordsmen like Ikki, causing him to train seriously.
- Whip Sword: One made of bones. The sword's range, along with his reflexes, gives him an advantage over Ikki and other melee specialists in general.
- The Worf Effect: Even after all his sword training with Kaito Ayatsuji, Kuraudo loses to Sara when she summons more Ikki clones than he can handle.
- Worthy Opponent: He realizes Ikki is a powerful foe because the latter didn't take his bait like most people. He also considers Kaito Ayatsuji one and somewhat regrets being unable to see his ultimate technique.
- Anti-Magic: His Noble Art, Tiger Bite, can also cancel an A-ranker's Noble Art. This also extends to devices, which are also made from magic.
- Big Brother Instinct: His motivation for participating in the Seven Stars Sword Art Festival and proving his strength is to get his sister to stop blaming herself for what happened to his legs.
- Big Damn Heroes: He saves Ikki from being killed by Ouma.
- Blade on a Stick: His device is a spear, giving him a range advantage over sword users like Ikki and Toka.
- Determinator: Yudai lost both his legs in a train accident and had to be treated by Kirko Yakushi, who used her water magic to create new legs from flesh from the rest of his body, causing muscle and bone atrophy all over his body. Despite this, he managed to make it through rehabilitation and rebuild his muscle mass to the point of regaining his combat capabilities.
- Friendly Rival: He treats most of his tournament rivals to his family's okonomiyaki restaurant in order to motivate them for the upcoming match in top condition. And he's not too pleased when he realizes Ikki came into battle with some sort of condition that causes him to freeze up.
- Genius Bruiser: He averts being The Idiot from Osaka when he matches wits with Ikki of all people.
- Hit-and-Run Tactics: In order to beat Toka, Yudai had to use his range advantage to avoid Raikiri.
- Javelin Thrower: Yudai's last gambit is to throw his device at Ikki while the latter is moving Too Fast to Stop while using it with Tiger Bite to prevent any attempts at blocking it. Though Ikki saw it coming and fools him with an afterimage.
- Kansai Regional Accent: All of his dialogue seems to indicate that he has an accent, not to mention that he's from Osaka.
- Martial Arts Headband: He sports a black hachimaki and is indeed a skilled martial artist.
- Awesome by Analysis: His ability to read his opponents is better than Ikki's, to the point where he's known as Eye of Heaven. He also extensively researches his opponents before their matches.
- Crazy-Prepared: While researching opponents, he'll look into their everyday habits in addition to their combat behavior.
- Didn't See That Coming: He thinks Ikki will try to save Ittou Shura/Rasetsu for the match with Sara Bloodlily, who recently got designated as an A-Rank Blazer and revealed near Story-Breaker Power. What he didn't realize is that Ikki already gave up on trying to beat him in a normal battle of wits, resulting in the latter using Ittou Rasetsu to instantly win the match.
- No Sense of Personal Space: Byakuya actually feels up Ikki's muscular body in order to describe how he's ideally built to be a swordsman.
- Weaponized Teleportation: His "God Hand" Noble Art can teleport immobile objects or people within a 50-mater radius of himself. If he manages to wound his opponent with his device, he can teleport them regardless of where they're moving.
- Weak, but Skilled: He's a C-Rank Blazer, but he's so good at researching his opponents that Ikki was forced to use Ittou Rasetsu to avoid being checkmated.
- Boomerang Bigot: Ironically, most of their followers are ordinary humans armed with guns.
- Evil vs. Evil: Their Social Darwinism is despicable and resulted in the deaths of countless innocents, but their collective power keeps the League and Union in a three-way deadlock. If Rebellion were to weaken with the loss of their leader, the Tyrant, the League and Union would start a world war.
- Fantastic Racism: Against non-Blazers.
- Western Terrorists: Though they seem to have members from all over the globe.
- Would Hurt a Child: They nearly killed a child in the mall for throwing ice cream at them.
- Ain't Too Proud to Beg: Despite his beliefs, he begs for his life when Shizuku finally gets the upper hand, which she doesn't oblige.
- Authority Equals Asskicking: Considering how he nearly killed Shizuku, it's obvious that he's as strong as his position implies.
- BFS: His device is a massive sword, which he has to wield with one arm.
- Blood from the Mouth: Along with foam and spittle.
- The Corrupter: He reached out to Alice during her darkest moments in order to recruit her.
- Faux Affably Evil: Wallenstein acts like a fairly friendly guy in order to lull Alice to his side, only to go apeshit upon her betrayal, showing his sadistic nature.
- Handicapped Badass: Despite lacking an arm, he's still a Master Swordsman with an incredibly powerful Noble Art.
- Hypocrite: Beats down and butchers assassins who show mercy, but begs for mercy when he's on the receiving end.
- Impaled with Extreme Prejudice: From the inside!
- No-Holds-Barred Beatdown: He delivers a brutal one to Alice due to her betrayal.
- An Offer You Can't Refuse: He makes perfectly clear to Alice that his "invitation" to join Rebellion was a mere formality. Refusal would have meant being kidnapped and forced to join.
- Red Baron: "The One-Armed Swordsman".
- The Social Darwinist: Lampshaded by the man himself.
- Wallenstein: "That is the undisputed truth of the world. The strong always devour the weak. Everything else is lies."
- Villains Want Mercy: Begs for his life when he finds himself in an unwinnable battle.
Device: Judgement Ring
- An Arm and a Leg: Courtesy of Ikki, who cuts off his hands both to disable his device and to punish him for humiliating Stella.
- Attack Reflector: His rings can be used to absorb and fire back attacks from an A-ranked Blazer.
- Hostage Situation: He uses one to force Stella to strip. He also plants one of his mooks among the hostages just in case he and his other mooks are defeated.
- Jerkass: He's not satisfied with merely defeating Stella and proceeds to force her to publicly humiliate herself.
- Wake-Up Call Boss: His ability and the way he reflected Stella's attack firmly establishes that a Leeroy Jenkins approach is foolish when fighting Blazers with unknown abilities.
A normal human who is famous for being able to match Blazers with just pure swordsmanship.
- Amazingly Embarrassing Parent: When he finally wakes up from his coma, he immediately asks Ikki to marry Ayase and take over the dojo. Ayase immediately issues a Dope Slap.
- Badass Normal: Unlike Ikki, who at least has some minor physical enhancing abilities; Kaito is a true example due to being an ordinary human who is able to fight Blazers with his own swordsmanship skills.
- Blood Knight: Being a Retired Badass, he doesn't get to participate in many sword fights. When he fights Kuraudo, he's actually thankful he can fight once more.
- Counter Attack: His swordsmanship is based on countering the enemy.
- Good Parents: One of few known examples in the series, while Kaito trains Ayase in order for her to takeover the dojo, he is nevertheless a caring father towards her.
- Handicapped Badass: Is still able to land a hit on Kuraudo despite his heart disease which has been severely weakening him.
- Hidden Depths: Although his sword style is for the purpose of protecting others, he's been longing for a Worthy Opponent.
- Master Swordsman
- Red Baron: Is known as "The Last Samurai", which is appropriate in the setting of the story.
- Weak, but Skilled: The ultimate example due to being an ordinary human.
- Worf Had the Flu: Downplayed. Even if he was in his prime, beating Kuraudo might be out of the question due to the latter's insanely fast reflexes.
- Affably Evil: Subverted. If it weren't for her temporary alliance with Rebellion, it'd be hard to tell that she was a rogue Blazer rather than an ideal knight. Although, she couldn't care less about their plans and is just returning a favour. She's not exactly evil, per se. She just happens to be a criminal.
- Outside of battle, she's actually a nice person. It really makes you wonder what exactly happened 15 years ago that made such a person become the no. 1 criminal in the world, considering she actually let Ikki, Stella and co. stay at her cottage when they went looking for her.(After she put them in a contract that is.) and one of her hobbies is making sweets during her free time. On the other hand, she's probably killed a lot of people for varying reasons. And when asked why she took up swordsmanship, her answer? She needed it for diet. Yep, you read it right people, the Best Swordsman in the World picked up the Way of the Sword because she was getting fat as a kid.
- Beat Them at Their Own Game: When Ikki tries a Vibroweapon technique on her, she sees through it and uses a stronger version of that technique, meaning she essentially used Blade Steal on him.
- Christmas Cake: She's concerned about becoming one.
- Curb-Stomp Battle: Delivers one to Ikki, who knows he can't win and only tries to stall her so Shizuku can save Alice.
- Curb-Stomp Cushion: Ikki not only manages to survive her strongest attack, he actually manages to wound her. A few drops of her blood are found on the pavement where she stands.
- The Dreaded: Even Kurono is terrified of her.
- Dual Wielding: She wields two swords gracefully, giving her the illusion of having wings.
- Lightning Bruiser: Even Ikki can't follow her movements, despite being able to see through the techniques of some A-rank Blazers.
- Master of Your Domain: Her swings are faster than most people can perceive because she moves all her muscles in a specific way. Just partially copying this technique allowed Ikki to become achieve Super Speed without Ittou Shura.
- Master Swordswoman: This is an understatement considering Ikki could only scratch her at best.
- Meaningful Name: Edelweiss (Leontopodium alpinum) is a white flower that grows in the Alps and is a symbol in that location.
- Nice Job Fixing It, Villain!: While she's not evil, her favor to Rebellion causes her to fight Ikki, which resulted in him learning her swordplay and muscle techniques. Several of his opponents would have been impossible to beat if it weren't for these skills.
- Noble Demon: She actually doesn't care about Rebellion's agenda and is only helping them out because of a favor they did for her. She offers to let Ikki and Shizuku retreat because they have no hope of winning.
- Razor Wind: She can create damaging vacuums in space with nothing but strength and precise swordplay.
- Superpower Lottery: Zigzagged. She's a Desperado, but her Noble Art doesn't enhance her combat ability.
- Supreme Chef: Her pastry skills are good enough to impress Ikki, who normally doesn't like sweets.
- Sweet Tooth: A very big one. In fact, the reason why she picked up swordsmanship was because her family was worried she was getting fat because of all the sweets she ate when was younger.
- Villain Respect: Edelweiss uses her strongest technique to defeat Ikki, out of respect for his swordsmanship and determination. He manages to see through it, survive and draw her blood.
- Weak, but Skilled: Downplayed in comparison to other Desperados. Her Noble Art can only make death contracts, which have little application in battle, meaning she can only rely on her swordsmanship and powers common to all Desperados.
- Winged Humanoid: Takes on metallic "wings" as part of her ultimate attack.
- World's Strongest Woman: In terms of wielding a sword, though it's unknown if she's the strongest Blazer period.
Prime Minister Tsukikage BakugaThe current prime minister of Japan.
- Affably Evil: Nobody who meets him in person would ever think he'd be a man who would side with terrorists as part of a convoluted plan to join the Union. Even Kurono, who has hard evidence, found it hard to believe. He uses this to his maximum advantage to give Akatsuki good PR.
- Devil in Plain Sight: He happily acknowledges his horrific behavior, but nobody believes him until it's too late.
- Evil Old Folks: He was Kurono's teacher when she was in the Blazer academy.
- Graceful Loser: Despite Akatsuki's loss, he's hopeful that Ikki's potential as a Desperado will increase Japan's chances of surviving the next world war.
- Insane Troll Logic: His plan hinges on the unlikely event that the Union welcomes Japan despite his collusion with Rebellion, a terrorist organization.
- Knight Templar: He is so absolutely convinced in Japan's utter superiority to the rest of the world that he truly believes igniting world war three by engaging in horrific criminal activity is truly in the best interests of Japan and its citizens, going so far as to say the territories conquered by Japan in world war two (Hawaii, the Philippines, and large swathes of Chinese soil, among other things) are Japan's territory by birthright. He is then completely incredulous when anyone points out the obvious flaws in this world view. (Like the fact that the "Japanese strength" he's boasting about is actually the strength of an international group of terrorists, most of whom aren't Japanese to begin with, and that the "weak" students who were brutalized were the very Japanese, he boasts are superior.) This is a facade for his true goal of getting Japan to join the winning side of the next World War, though he fails to see a major flaw in his plan.
- Obliviously Evil: He can't begin to comprehend how ordering a terrorist attack on a school in his own country, and on students composed almost entirely of his own citizens is a bad thing. He does acknowledge that it's unpleasant to be attacked but completely fails to see how the attack itself is wrong.
- Precognition: His device is a crystal ball that can see past and future events.
- President Evil: He was elected Prime Minister, and Kuruno points out in volume 5, chapter 1 that his personality is exactly the same as Prime Minister as it was when he was her teacher.
- Shut Up, Kirk!: Pulls this on Kurono when she confronts him regarding his plans to ignite world war three by using Rebellion and Akatsuki to commit terrorist acts.
- Tsukikage Bakuga: "Things have reached the point where I can not be stopped by a simple school teacher like you. Know your place, and do your duty as a school teacher should!"
- Stoic Spectacles: He wears glasses, and does not show emotion.
- Well-Intentioned Extremist: His Noble Art predicted that the Union and League would go to war, resulting in the Union winning and destroying Japan. By forming Akatsuki, he hoped to ditch the League and join the Union to prevent Japan's destruction.
The puppeteer of Reisen Hiraga and the leader of Team Cradleland.
- Abhorrent Admirer: He's a sociopath with a bizarre fixation on Stella.
- Ain't Too Proud to Beg: Starts pleading for his life as Stella is incinerating him at the climax of Volume 15. Stella tells him where he can shove it.
- Auto-Revive: In Volume 15, after Johann smashes his skull, he unveils his strongest Noble Art, Dance Macabre, which reconstructs his body with flesh and bits of debris from whatever is around.
- Animal Motifs: A spider. Fittingly, his Device is named Black Widow.
- Big Bad: The primary antagonist of the Vermillion Empire Arc.
- Cain and Abel: The Cain to Iris' Abel.
- Enfante Terrible: Even as a child, he could only derive pleasure from bullying other children and, after his powers awakened, injuring people and breaking up relationships with his PeoplePuppets abilities.
- Hero Killer: In volume 15, he butchers Ikki Kurogane. If it wasn't for Shizuku, Ikki would have stayed dead.
- The Man Behind the Man: To Reisen Hiraga, who was actually a puppet he created.
- Manipulative Bastard: Aside from the People Puppets deal, he exploits Iris' long-repressed Big Sister Instinct to turn her against Ikki and Stella, which ends up getting her killed.
- Marionette Master: Has both artificial puppets and People Puppets to fight for him, though he is definitely no slouch in one-on-one combat either.
- Meat Puppet: Dance Macabre turns him into one.
- Mismatched Eyes: One red, one blue.
- My Death Is Only The Beginning: His Dance Macabre resurrects him after death by piecing his body back together with his threads. This explicitly gives him an exponential power boost, as well as making him immune to most forms of harm by virtue of being a living meat puppet running on magic.
- People Puppets: One of his favorite applications of his powers. He can insert his strings into the bodies and brains of his victims to control their every move while they are conscious and unable to stop themselves.
- Razor Floss: Black Widow takes the form of a multitude of strings, which he can use for slicing people up or controlling puppets.
- Screw Destiny: As a Desperado.
- Tears of Remorse: Does this when Stella's "The Reason You Suck" Speech to him as she is burning him to a crisp causes him to realize that Iris loved him the whole time.
- Wild Card: He seems to have no concrete goal in mind for his atrocities other than amusement. The start of the Vermillion Empire Arc has him and his team betraying and slaughtering most of Rebellion's leadership despite being one of their executives just so he could pursue his interest in Stella.
- Where I Was Born and Razed: On his tenth birthday, he used his powers to control all of the residents of his village, including his parents, and make them kill one another, leaving only his sister Iris alive. The incident became known as La Croix Sanglant.
A member of Team Cradleland.
- Green Thumb: Her device allows her to control plants.