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
Tada Banri is the main male protagonist of the series. Having had a nearly fatal accident shortly after high school graduation, he lost all memories from before then. He spent a year recovering and has now entered law school. Later on in the series, Banri begins to pity Kouko as she's always alone because everyone finds her beauty and wealth intimidating. Banri is shown to a "Ghost" of himself watching over him before losing his memory. In episode 7 of the anime, he and Kouko officially begin dating. It is revealed that Banri and Linda were childhood friends who attended the same class in highschool. It is later shown that Linda is the primary reason for Banri's decision to attend a university in Tokyo, with her being the one who suggested it. In episode 21 of the anime, Kouko breaks up with him. In episode 23 of the anime, he fully regains his memories prior to the accident and forgets everything that happened after. In episode 24 of the anime—with Koko's mirror as a catalyst—he remembers everything after the accident, meaning he gained his memories prior and after. The "ghost" of his past self disappears after finally hearing Linda's response.
Sa Kyung's older sister. She is the one that pulled Moon Bin underwater in the pool, and therefore responsible for his trip to the past. Ultimately raped and killed by Sali Tayi. Before her death, her body was in a comatose state, yet her spirit - both while she was living and dead - often visited Moon Bin.
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.
Nana is a third-year female student. She dresses and acts similarly to the character of the same name in the manga "Nana." She also lives next to Tada Banri in the apartment buildings.
A second year student and Banri and Kouko's senior in the Festival Research Society. Her nickname Linda (りんã� ) is an alternate reading of the kanji for Hayashida (æž—ç”°). Banri's friend during high school and his romance interest; she now follows him and keeps an eye out for him, though he cannot remember her at all. She kept their shared past hidden from Banri until Banri found an old photograph of him with her; apparently they were very close. It has been revealed that she was confessed to by Banri after their graduation but she couldn't give an answer right-away. Banri never got to know what her answer was as he had the accident that resulted in him losing all his memories from the past in the very place he was waiting for her to give him a reply. She held herself responsible ever since that fateful night. Later when she was asked by the current Tada Banri what would have been her reply in that fateful night, she said it would have been obviously a "No." However, strong indication is left that she told him the exact opposite to her real answer because by now he has started going out with Kouko. It is revealed later on that she really still has feelings for Banri when she met him outside the hospital he escaped from while her being represented to have enormous guilt towards Banri's accident before losing his memories. She even tells him it was already too late for her to reach him and save him by holding his hands tight. When Banri asks her what message she wants him to deliver, Linda talks about supporting him to do his best yet she adds she must not talk that way and therefore changing what she wants to tell him afterwards. Banri doesn't remember her final words, however. Also, when Ghost Banri finally "comes out of present Banri" Linda runs to him, saying that the answer would've been "Yes!" to his confession Banri is calling her "Barbara."