One of Borcuse's elite guard and commanders. Despite looking like a child, Nike is actually 25 years old. While she display a look of a sweet, innocent girl, in reality she is a sadistic killer who will not hesitant to kill anyone who angers her, whether they be enemy or ally. Io is the only one who can calm Nike as he treats a her like a little sister. Nike's Golem is the Heavy mech Giratos.
A little Russian girl, no more than ten years old and with the beauty of a doll, she arrives in Japan shortly after the beginning of the war of the Qwasers. While she is presented as extremely shy and child-like, befitting her age (she has a habit of addressing herself in third person in these instances), her true colors depicts her as a domineering, arrogant, prideful and almost malicious queen, all maintaining a facade of childish innocence. She is a powerful Qwaser who wields the element of copper, which usually makes her gain control and manipulate electrical wires and redirect their flow to electrocute and incinerate her foes. She does not fight herself due to her frailty as a little girl, and this is why she is always guarded by a grim, archaic gynoid dressed in regal attire named Anastasia, which Ekaterina calls mother for reason currently unknown. She currently attends at St. Mihailov's primary school, being the subject of admiration and love of her classmates and teachers thanks to her doll-like features, and has Hana serve as her slave and replenish her of Soma. Recently, it has been revealed that she shares heavy connections with the Imperial Family of late Tsar Nicholas II, and it is heavily hinted that she herself is the same Tsarina Alexandra that served as Nicholas' consort, though this is has not been proven, and suggested by Ekaterina herself (although this would also explain why her guardian gynoid is named Anastasia). Ekaterina's nickname is Katja.
Gilbert G.P. Guilford is a slender, dark-haired, bespectacled man who was once known as the 'Spearhead of the Empire'. He is confidante and personal knight to the Second Princess Cornelia, and commands her Glaston Knights. Though he initially pilots a Gloucester, he switches to the more advanced Vincent model in the second season. He informs Jeremiah Gottwald of his demotion shortly after his arrival, and helps to end the Black Rebellion with the help of the Glaston Knights. Following Cornelia's disappearance during the rebellion, he remains in Area 11, dutifully awaiting her return. After Viceroy Carares is killed in the second season, Guilford serves as a temporary replacement prior to Nunnally taking over the position.
A demon that was originally sent to kill Gekkou only to be overpowered by him and be forced into entering a contract with him. She can only use her powers after being kissed by Gekkou on any part of her body. She is a very energetic loud, noisy girl and has lightning powers. She is also a tsundere. A demon originally sent to kill Gekkou by Gekkou's younger twin brother, Hinata. She eventually falls in love with Gekkou. She loves Dr. Cinnamon soda.
Kurenai Gekkou, a freshman and also the student council president of Miyasaka High, is a self-proclaimed genius. Nine years ago before the starting timeline of the story, due to a certain deed committed by his younger twin brother, Hinata, Gekkou was prompted to constantly seek out power, initially driven by the fear for his life, and later motivated by the prospects of revenge. Gekkou is demonstrated to be quick-witted and highly intelligent. He wields an ancient fencing-like sword known as Spell Error, and is trained in several traditional arts of exorcism. As the student council president, he has made a contract with and is tasked to be guardian of the Holy Ground, a location with certain special properties over which Miyasaka High was built. (Source: Wikia)
Taito's classmate who is in love with him. She is shown to have a split personality, which is not human. It was shown than Haruka was created out of her real person to watch out for Taito. Her 'real' personality is not as modest and shy as Haruka is, and she can be compared to Himea in terms of hostility. She is seen working with Serge and Hasga, but it is unknown as of now.
She is a sweet, sociable, caring and a generous person who is close to children, she is one of the three girls who manages Le Coeur bakery, though she can bake, she is mostly in charge of hawking their baked goods either in the neighborhood or in town. She frequently drops by the town's orphanage to hand out excess unsold bread or pastries to the orphans. It is later reveled in episode 7 that just like the rest of the girls of Le Coeur, she was found by Madera when she got washed up along the shore with no memory of her past.