Blush is a general in the U.S. cavalry and a member of the Syndicate. He murdered Fino and Yaghi's parents when they refused to give him information leading to the "treasure", or Zodiac Gun. He had pretended to be wounded and allowed the family to nurse him back to health so they would open up to him about the treasure. When Cavanaugh steals the Zodiac Gun from him on their way back to New York, Blush is furious that she is stealing his reward and tries to shoot her. In the midst of the ruckus, he disappears and isn't seen again except as a silhouette at the end of the story. But Fino and Alternate are still determined to find him. (Source: manga)
Daitetsu, or Mr. Kunikida, is the Chief Director of the TAC. When Kaede and Momiji were born, Mr. Kunikida raised Kaede like his own daughter, but he exploited her ability to track down and kill the Aragami. However, when Kaede sacrificed herself, he felt heartbroken. With Momiji in the TAC, Mr. Kunikida decides not to exploit her abilities like he did with Kaede and instead treated her like a normal girl. Source: Wikipedia
A 13-15-year old girl who is on a quest to find the location of the ancient Monster called Phoenix. Holly uses a magical pendant to locate new Mystery Disks that contain monsters. Though she denies it at first, she learned that her father has become a vessel for the soul of the evil Moo. After the Phoenix and Moo destroyed each other, Holly went on a quest to find Moo's Mystery Disc to save her father from the very monster he had become. (Source: Wikipedia)
Hime is an teenage girl who's lived all her life in an orphanage and lead a boring life... until the day she witnessed the revival of a Brain Powerd. Since then, she became one of the few people who can actually communicate and pilot a Brain Powerd. Now she fights against Orphan, alongside the people at Novis Noah.
Orphaned at the age of ten because her parents were killed by the Blue, Marlene was one of the few lucky ones to make it to Second Earth. Since then Marlene has dedicated and trained herself to defeat the Blue, taking all kind of vicious training during her early days making her lack of many female atitudes. She doesn't understand the difference between a woman and a man, making it difficult for Yuji to deal with her. Though seeming very cold in the earlier episodes, as time progresses, Yuji opens up Marlene's emotions.
A high-ranking member of the science division on Second Earth. He suggests that Marlene and Yuji are kept together in order to get the best results from Yuji in the sleeper program. Not agreeing with the High Council's leadership of Second Earth or it's reckless use of the sleepers, he eventually forms a group called The Arc.