Sonoshee is the winner of the Yellowline Race which qualified her to enter the Redline race. She's commonly known as the Cherry Boy Hunter even though it was never completely described why. Through JP's flashbacks, we learn that they knew each other from awhile back. Her father was a racer and she got the urge to race from him.
After the One Year War, the girl who would become Four Murasame lost her family, and was adopted by the Murasame Research Lab. It was there were the Federation used and trained her to become an artificial New Type (or "Cyber - New Type"). The scientist in charge of the project erased all her memories from her previous life and just gave her number 'Four' as the name. Namika Coner, the nurse in charge of her, convinced her that working with the Titans and fighting the AEUG was the only way that she had for recover her memories. After escaping from Kennedy Space Center, Karaba's flagship, the Audhumla reached New Hong Kong for supplies. It was in this place where she meets AEUG pilot Kamille Bidan, and not knowing that he was an enemy, she feels bonded to him, since he is the first person who ever regarded Four as a person in her own right and not as a girl without memories who is bound to become a living weapon. It is only after the truth regarding Kamille is revealed to Four that she choose to pilot the giant Psyco Gundam and attack both Kamille and the city; her desire of getting her memories back and become a full-fledged person are more important than anything. Kamille desperately tries to calm her down and make her join the AEUG, to no real avail. After the battle, Four helped Kamille and his Gundam Mark II back out into space. During this events the Psyco Gundam is severely damaged and Four is presumable killed in an explosion. However, it was later revealed that Four and the Psyco Gundam survived and were taken to the Titans' Kilimanjaro base in Africa. Once there, the Psyco Gundam was repaired and equipped with an experimental new "psyco-control chair", further enhancing Four's abilities to control the Psyco Gundam. Furthermore, Four was forced once again to undergo medical experiments in order to increase her powers, almost losing her memories of Kamille. At the beginning of November, U.C. 0087, the AEUG and Karaba launched an attack on the Titans base at Mount Kilimanjaro in Africa. Led by Amuro Ray, they were also supported by Kamille Bidan and Quattro Bajeena. It was then that Kamille discovers that Four was still alive. Four finally remembers Kamille when he infiltrates the Titans base to save her. Four was glad to see him, but the backlash coming from her treatment as well as her own mental instability were a huge hindrance. In the end, Four was forced once again to fight against Kamille in the Psyco Gundam, but eventually sacrificed herself to save Kamille from Jerid Messa.
A brutally honest student who belongs to the cooking club. She is often shown moaning about being surrounded by "idiots" in her class, or telling people off. She loves slasher films. wikipedia http://en.wikipedia.org/wiki/Doki_Doki_School_Hours
Also know as the "Meister of Tragedy" Mai was an extremely gifted Otome a few years prior to the show that mysteriously disappeared one day in the Sprites Forest. Before she disappeared she had been offered the position of being #4 of the Five Pillars, but it was said she had fallen in love with a young noble and was torn between the two dreams. She was Natsuki's rival from her days as a student and is Zipang's Tokiha Takumi's older sister. She finally appears to Arika at the end of episode 22 and is living with the Cat Goddess, Mikoto, in the Black Valley. The valley is part of the Sprites Forest and actually exists in another dimension, though it frequently crosses over with her home world. It is later discovered that she never was actually torn between love and being an Otome, and had simply gotten lost while taking a walk and ended up in the Spirtes Forest. In the forest she is accidentally captured by one of Mikoto's food traps, and Mikoto accidentally swallows one of her Meister GEMs, making Mikoto her master. In Mai-Otome Zwei, she still lives with Mikoto in the Black Valley, now called Mt. Nekogami, and has opened a Ramen shop in the newly formed town at the base of the mountain. Her GEM is known as the Fire Stirring Ruby. Her Element, Ignition, is still the same golden rings she had in My-HiME. (Source: Wikipedia)
Mipple (ミップル , Mippuru) is the Princess of Hope from the Garden of Light. She, like Honoka, is generally more reserved than her male counterpart. She's always sticking up for Porun, though, once he comes on the scene, and that tends to cause problems between her and Mepple. She resides predominantly with Honoka and ends all her sentences with the word "mipo."