Milly is the younger sister of Zeon spy Miharu Ratokie. When Kai decides to leave White Base, Miharu invites him to her home where he meets Milly and Jill. When she decides to sneak aboard White Base, Miharu provides Jill and Milly with money so they can eat, and says goodbye to them.
The series' main Protagonist. A sixteen year old male virgin studying at Kyuugetsu Academy. He's a perverted boy who loves to play lewd jokes. He enjoys collecting rare juice cans and basically likes juices. One day, he bought a melon soda that transformed into a girl, which was an Akikan. He was later invited by Hidehiko Otoya to join the "Akikan Elect" and "Intelligence Port Project" but being a person who hated fights, he rejected the invitation (although he was later forced to participate). Later, he made his mind to crush those projects together with his comrades. A certain incident during his sophomore/junior high school days made him afraid of hurting somebody. (source: Wikipedia)
From Wikipedia: A government official designated to Department of Economy. He is the person who established the "Akikan Elect" and "Intelligence Port project", though his motive for their establishment is not yet clear. A self-proclaimed gay who loves pretty boys. He's often having contact with Kakeru, harassing him sexually.
Pai is the last of the Sanjiyan—a magical race of 3-eyed creatures—and she comes in search of Tokyo high-school student Yakumo Fujii with news of his father's death and hopes of becoming human. (Source: AniDB)
Hei's younger sister. Pai is the Contractor responsible for the disappearance of Heaven's Gate five years prior to the story's setting and had since vanished. Her name means white in Chinese, while Hei means black. The Messier code BK-201 belongs to her star. Pai's abilities are said to be vast, with generating abnormal electricity as only the tip of the iceberg. In addition to this, she also has the power of molecular reconstruction. Her remuneration is to sleep. At the time of the Heaven's War in South America, Hei was constantly together with Pai during their many operations, acting as a bodyguard of sorts. It was for Pai's sake that Hei originally joined the Syndicate. When the Heaven's Gate disappeared, Pai's power became Hei's, because—according to Amber—she continues to exist within him. Hei himself remains oblivious to the fact, until the very end. Her real name is revealed at the end: Xing (which may in this instance mean "star".)
A hunter that fought beside princess Mikoto 1000 years ago.