Sayuri Ando is Ken's little sister. She is sickly due to the unhealthy environment in Tokyo and suffers asthma attacks that would sometimes require hospitalization. She is quite fond of Ken but gets upset when Ken and their father gets into a heated argument.
Mary-Ann is one of Plumfield's maids. She's a pretty red-haired girl.
A young man named Nobuo Tanaka, who has come down with the flu. After receiving a flu shot at a doctor's office, he goes to work as a lab technician in a bio-research facility. At a colleague's insistence, he takes some experimental pills found on the facility's director's desk. The pills turn out to be part of a biological weapon program, reacting to the chemicals in the flu shot inside his body. Tanaka soon acquires a (literally) deadly body odor and becomes a walking weapon of mass destruction. After waking up from a nap, he finds everyone in the facility dead, though at first he thinks they are just unconscious. He reports the incident to headquarters and is instructed to deliver some papers and the experimental drug to Tokyo. The head of the research company and the Japanese military later realize that Tanaka is causing the poisonous gas and order him to be killed. The self-defense forces futilely attempt to keep him from delivering the experimental drug to Tokyo. (Source: Wikipedia)
A pocket-sized, lime-green creature whom befriends Dia and terrorizes Ascoeur and Q-feuille when the trio are assigned to investigate the ruins of the GOTT headquarters. With Dia's kiss, he was able to gather remnants of nanotechnology to shape-shift into a Genetech Beast. The trio bring him back to the GTO headquarters where Dia wears him as a necklace. Though they omit his presence from the debriefing, Hiver knows and does not disapprove. Source: Wikipedia
Troisienne was the quieter, more composed of the two but equally admired by both Ascoeur and Q-feuille, although arguably closer to the latter due to her otaku tendancies. Her ability allowed her to literally stop time, but she was only able to do this a few times before becoming fatigued as it produced a great strain on her body. Like Trixie, her sudden and violent death had a great impact upon Ascoeur and Q-feuille, as well as representing a change in tone for the series. (Source: Wikipedia)
Geacht'er is the leader and founder of G Society whose goal is to dismantle the GTO. He projects a message to Aineias claiming that the GTO are corrupt and that his G Society will bring peace to the galaxy. His ability is to plant deadly roses onto targets. These roses are white before turning red while the victim is dying. After the death, the rose then turns black. He has also inherited the ability to manipulate time. Many of the G Society believe he is not who he claims to be, but are too scared to voice their thoughts aloud. He seems to have an interest in Ascoeur. It is later revealed he was the one who caused the incident 25 years ago, trying to destroy the universe and since then has created the G Society. It is currently unknown if he is trying to attempt to destroy the universe again, and is only using the Nouvelesse's hope to regain their title for his own gain. In episode 15, Geacht'er reveals to Ascoeur that she is his sister Liselotte and that his real name is Alfred, given that they share the same rose birthmark. Since then he seems to have become obsessed to have his little sister with him, something that has caused noticeable jealousy with his more devoted Shadow Workers like Saphir, Shade and Letuchaia. Despite his polite and kind personality, he is able to kill anyone in his way without a second thought.
Ichirou, is a perverted young man with a fetish for witches. While peeking on his teacher, the beautiful witch Yuuko. Ichirou provokes the wrath of one of his classmates, who also happens to be a witch, and is turned into a tentacle monster and "forced" to absorb the mana of witches in order to stay alive.