A young martial artist, and head of the Kyotouryuu style, living with his sister on a desolate island. At the start of the series he is approached by Togame, an underling of the shogunate, to help her find the Twelve Perfected Deviant Blades. He falls in love with her and agrees.
Does Not Like Shoes: Even while he is covering his chest, his feet are still bare. As he carries Togame through a blizzard, while she whines about how cold it is. And then life-threatening Hilarity Ensues.
Sacrificed Basic Skill for Awesome Training: He spent his entire life training under his father to master Kyotouryuu on a deserted island. At the start of the series he has absolutely no knowledge of the outside world and can't even pick up the differences between other people. Another side effect of Shichika's training is that he is completely unable to wield swords.
Scars Are Forever: He retains some of the scars received in his final battle with Emonzaemon, particularly the one over his left eye.
Self-Made Orphan: Killed his own father for unexplained reasons. Episode 7 implies it was to protect Nanami... not that she would need it.
Skilled, but Naive: He's spent his entire life on a remote island cut off from civilization with only his sister and his father. While he did receive 20 years of training in Kyotouryuu, a powerful fighting style that is essentially "swordsmanship without a sword", he lacks actual battle experience.
Willfully Weak: He's given orders by Togame to protect the swords, Togame, himself, and himselfnote It Makes Sense in Context, which proves to make some of the fights more difficult. In the last episode, he is under no such restrictions, and shows exactly how powerful he is by destroying all twelve swords. How much the restriction to protect himself mattered is evident during his duel with Emonzaemon.
Irony: Strong enough that she can copy all techniques just by watching them... then we learn that she actually uses this in order to be weaker, as her natural power is just that strong that it could kill her.
Ill Girl: Due to her unnatural strength, although she can never die from it.
Lack of Empathy: She is not a particularly caring person when it comes to mooks.
Little Big Sister: You likely wouldn't believe she's Shichika's older sister with just looking at her childlike body.
Made of Iron: Despite her weak body, she is surprisingly resilient. The prime example would be her death. After taking a full-on Shichika Hachiretsu Kai, Akutou Bita (the Deviant Blade sustaining her life) was pulled out of her chest, leaving a gaping hole in it. She then gets up and starts using her full strength, damaging her body even further. She manages to fight with her little brother evenly for a short while after that, but dies when she is hit by Shichika's self-titled ultimate move a second time.
Multicolored Hair: Pink blotches for highlights. The artist(s) chose to use pink rather than a lighter green.
Villain Protagonist: Had shades of this in episode 4, but becomes utterly if not pure evil in episode 7 if not for her tragic backstory to redeem her slightly.
Willfully Weak: Despite being physically weak and ill, Nanami starts the series able to easily defeat her brother, who defeated the official Greatest Swordsman in Japan. Turns out, she can also copy any skill she sees, including super-strength, spontaneous claw growth, and walking on water. Then it turns out that she has inhuman resilience and can't die no matter how sick or poisoned she becomes. Then it turns out she's acquired one of the Deviant Blades, which cures her weakness and low energy. And then it turns out she uses others' skills so she can be weaker, as her instinctive combat skills are utterly perfect!
Yamato Nadeshiko: With long black hair and a yukata she definitely looks the part, and with her sweet tone of voice she sounds the part. Even her method of fighting is more feminine than her brother's as she watches instead of trains. Subverted as she's actually a brutal Death Seeker that tortures without a thought.
However, she doesn’t lead Emonzaemon on and clearly establishes that she wouldn’t want him to sacrifice his life for her, admits that she liked Togame even when she ordered her death, and is ready to be killed by Shichika. Her actions were irreproachable, but her personality doesn’t help her.
Spanner in the Works: Just like Shichika, she makes Shikizaki's plan fail because she had no interest in ruling.
Theme Naming: Her name means "denial". In contrast with Togame's real name, Yousha ("approval").
A swordsman who lives in a vast desert in the country of Inaba. Second Deviant Blade user Shichika and Togame run into. The second Deviant Blade, Nakamura; is incredibly sharp and can cut through anything.
Deadly Upgrade: Covering Zantou Namakura in blood increases the speed of the Zerosen technique. After Ginkaku covered his sword with his own blood, his ultimate attack changed from 5 simultaneous slashes to ten.
The Fettered: He exaggerates this trope: The desert has invaded all his land. His castle is ruined; he is the only one left, when Shinizika ask him why he fights, he sincerely answers he doesn’t know. Even so, he’s willing to die defending his sword only because he must defend something.
Fragile Speedster: Just a combo from Shichika gets him done... the problem is getting close enough to punch him.
Badass Adorable: Isn't she just the cutest thing ever. She's also the first opponent to defeat Shichika.
Confusion Fu: She has no training at all, but that means Shichika is totally unable to read her—making her deadly, considering her Super Strength. Kyouken, who has thousands of years' worth of training, controlling her body easily removes this problem, however.
Deviant Blade number eight. Protector of a dried lake.
Deceptively Human Robots: She seems fairly humanized at first glance, but she's never portrayed as anything but a particularly well-designed object, and is easily defeated once you figure out her limited range of programmed actions.
Justified Trope: Kiki Shikizaki was a soothsayer who could see the future of technology, as Togame lampshades, it’s the only way he could have created swords that, in that era, appear to break physic laws, but could be perfectly possible in the future.
Revenge Before Reason: She went after Shichika and Togame to avenge the Maniwa members they'd killed... in blatant disregard of the fact that Houou had just formed an alliance with them! Not to mention, Shichika and Togame were only responsible for Koumori's death. The other five dead Maniwa members at the time were killed by either Nanami or Deviant Blade Wielders.
Super Speed: In her first form, to the point of that she cannot be seen if she doesn't wants to.
The leader of the Beast Squad, he is invaluable to the Maniwa Corps as he can ascertain the locations of the Deviant Blades. He is willingly killed by Houou in order to maintain the alliance between the Maniwa Corps and Togame.