The protagonist of the story, Nyurei is halfway between an Anti-Hero and a Villain Protagonist."Your grandkids will have the communications devices implanted, they'll be bio-powered and online 24x7, feeding video data through contact lenses and audio through some form of cochlear implant. They'll live in an augmented-reality world where every building and vehicle and person has tags floating around them, and 'unplugging' will be tantamount to putting on a blindfold."
Card-Carrying Villain: He takes sadistic delight at describing his past and future acts, styles himself as an "anarchist supreme", enjoys messing around with peoples' heads (and ruining their lives), leaves behind these symbol-scars on his victims as a Calling Card, fully embraces his status as an unflinching Complete Monster, and intentionally positions himself as an Evil Counterpart or a Shadow Archetype to most of the protagonists.
Chekhov's Gunman: A TV once showed a reporter explaining a brutal murder scene, eerily similar to how Nyurei himself usually operates.
Crazy-Prepared: He's got backup plans upon backup plans upon backup plans. Someone goes for a third option? He kills the decider before he manages to live up to his choice. Someone cracks his mask? It was a fake. His arm gets cut off? Prosthetic. Break his sword? It's a fake, laced with poison-filled sparks. Break the real one? It regenerates and grows larger, quick enough to stab you somewhere.
The Dreaded: Definitely one of the most threatening villains around these parts, as evidenced by an Executor running away after meeting him.
Foreshadowing: He can make after-images of himself that seem real, and in some cases, are real. At times, it looks as if you're seeing the outline of someone attempting a Flash Step, but you can't tell which is the actual image. At one point, his reflection on a car window leaves the car itself unresponsive. Once he leaves, the car works again. Shortly thereafter, that same reflection possesses the car.
Fighting a Shadow: Such proxies include Murakumo, Tsukuyomi, Amaterasu, Susano'o, Izanagi, Kony Matchar, the Monolith, all of the Marauders and Nylorow Rothage.
Hero Killer: The simple act of not running away from him, is enough to signify that his opponent is a Badass. That's how dangerous he is.
Hidden Agenda Villain: His motives and goals remained unclear for nearly the entire story. Clues were dropped around, hinting at what he might've wanted, but we never get any real confirmations until the end.
Humanoid Abomination: Heavily implied, as his every appearance makes him look and act more surreal than the last; the more we learn of what he looks like, the less humanoid he seems, and the more horrific his acts become.
Lack of Empathy: He once stopped his men from attacking a grieving daughter mourning over her dead parents, but it was only to allow her to become as much of a monster as those killers later in her life.
Manipulative Bastard: A standout case would be him turning into the person that negatively affected their lives the most and pretending to make amends, only to betray them afterwards.
Nietzsche Wannabe: He seems to hold a rather nihilistic viewpoint of the universe at large, particularly in his belief that the existence of a single person is largely insignificant, its appearance unnoticed and its passing unmourned.
However, he chose to create his own values after realizing the insignificance of the current ones; his anarchistic, omnicide-craving demeanor almost seems like he's either desperately trying to achieve a purpose in life, or he's trying to 'save' people from such a meaningless existence. Furthermore, the fact that how corrupted others into nihilists or monsters like him might even be his attempt at trying to stave off loneliness.
Uniquely, however, given his origins, he's actually in a position to end the nihilism of the universe. He's in a position to end of malignancy, the malaise and wastrel milieu. He can end, break every "truth," moral, ethic, kill every tradition. He's inherently human, but he has had the power to completely move beyond it. Succeeded in sublimating the nihilistic kill-switch, the fatalism and all the rest. Embracing what he is, realizing that he controls it - he has moved to such a higher existence (not divine or anything, but his existence as an individual in the universe with awareness/access to the building blocks, foundation)... he could free everything.
By fiat of reaching the posthuman he has the capability to eviscerate that which he doesn't like. He can comprehend whatever it is (Seithr) that fueled his self-apotheosis. He doesn't have to remember being human to do what is best. He has to realize that regardless the value, worth, importance, etc. of humanity, he now has a responsibility. Assist their development into trans- and post-humanism, or remove the species he willed himself to leave behind, he willed himself to evolve beyond. Wipe them from the face of existence. Which means that he fails, because he is a coward that hates himself, rather than them.
Nothing Is Scarier: He intentionally refrained from showing himself to his first on-screen victims, in order to elicit such a reaction.
Obfuscating Insanity: Towards strangers, he specifically portrays himself as the more realistic, non-violent example of a psycho, in order to keep his real motives and thoughts unknown.
Omnicidal Maniac: Desires to annihilate the various dimensions from existence, but it's ultimately deconstructed. Although he certainly seems to enjoy specific bouts of chaos, it's implied that he feels that he has to achieve total omnicide, and that he thinks he's doing the universe a favor for trying to blow it apart.
Power Parasite: By impaling someone with his sword, he absorbs their energy and uses it to replicate their abilities.
Psycho for Hire: Whenever someone's desperate enough to employ him under their wing, at least.
Spanner in the Works: Although he allies himself with people that would 'supposedly' allow him a chance to wreak havoc unchecked, Nyurei manages to obstruct and derail everybody's plans, while he's on their side, no less.
The Heart: His aforementioned passion and intensity lift those around him. When a teammate is intimidated, Arnett's there to back him up. If his teammates are struggling, Arnett's shouting in their ears to keep fighting through. If his teammates aren't as aggressive as they should be, Arnett riles them up to get them motivated. If one of his teammates falls to the floor, Arnett's the first one picking him up.
The female protagonist. A Second Year Protagonist, she's an accomplished athlete and sports player, ranking 3rd best overall in the Elaborate University High. A popular young girl, Marina's outgoing personality, driven attitude and great looks endear her to students and teachers alike.
Blood Knight: She enjoys the adrenaline rush and unpredictable excitement that comes from a good fight, which is especiallyevident once she gets excited, but she doesn't want to fight all the time, nor does she like losing any good people along the way.
Poison Is Corrosive: Anything she touches is instantly eroded away by the poison that drips from her arms. If contacted with skin, the poison devours and disintegrates it down to the bone, leaving it as a broken, shriveled husk of an exoskeleton once done.