Mariemaia Khushrenada is the daughter of Treize Khushrenada, the Duke of OZ and Leia Barton, daughter of Dekim Barton and sister of the real Trowa Barton, conceived during the meeting between the two on Colony X-18999 (as detailed in the Episode Zero manga). Supposedly dying at an early age, Mariemaia later resurfaced as the figurehead of the Mariemaia Army, which largely consisted of soldiers who had been loyal to Treize. Thanks to her grandfather Dekim's grooming, she was fully prepared to ravage the Earth and take her place as the World Sovereign, believing this to be what her father, Treize, would have wanted. If Operation Meteor went as planned, the young girl would be ruler of Earth, as stated by her uncle, though, in fact, she would be a puppet ruler as seen by her grandfather. Mariemaia kidnapped Vice-Foreign Minister Relena Darlian so there would be no opposition to the Barton family's rule over the Earth. The occupation of Earth was quick with no resistance and victory seemed assured, that is until a number of insurgents, including the Gundam pilots fought back. Mariemaia felt that their efforts would soon be exhausted, until the populace stands up and Wing Zero destroys the shelter. Dekim urges her to take up her rightful place as ruler of Earth but Relena slaps sense into her, literally. She then saves Darlian's life when her grandfather tried to kill her. Lady Une soon has her rushed to medical attention. Soon afterwards she makes a full recovery and is adopted by and placed in Une's custody. Source: Gundam Wiki
Upper First Class exorcist from Taiwan branch. Comes to Japan to help True Cross Academy change a new barrier. From an elite family and has high exorcism skills.
Another sleeper on Second Earth who is paired with Tony. She is very young and often naive. She immediately gravitates towards Yuji, seeing Marlene as an obstacle to a relationship with him.
Me-Mania is one of Mima's biggest fans, to the point where he is totally obsessed with her. When Mima starts to do things that go against his expectations of her, he becomes a stalker believing himself to be led by a "true" Mima.
Rei is a singer in the pop music group CHAM! After Mima left, Rei and Yukiko become more popular, which results of them getting into the best singing group charts. She does seem to care about Mima, even when she changed careers. In one scene in the film, Rei and Yukiko are on their radio talk show and when they bid goodbye to the audience, Mima's apparition appears. Although Rei is happy to see Mima, but is shocked when Mima suddenly leaves and goes after the apparition. (Source: Satoshi Kon Wikia)
Producer of Mima Kirigoe. It was his idea to promote Mima as an actress, but Hidaka Rumi didn't support him on that.
He was supposed to be the final victim of Me-mania, however he failed and both Tadokoro and Me-mania were killed by the real culprit.
Jiro is the owner of the shadow Minotaur, who uses white magic in the game. In the anime, Minotaur is always chiding Jiro for overusing his energy in battle but generally takes a calm approach to opponents. from wikipedia