Leader of both the Befort Children on Earth   ~!and the team of scientists during their time spent on Greecia. !~  He often does the talking for the group and takes responsibility for their actions. (Whenever a character is angry with the group as a whole, that anger is often directed solely to Agi.) He comes across as a very quiet, distant person, but he does in fact care more about the people around him than he lets on. This side of him rarely shows through because he is so determined to find Tina and is often scolding the others for not having their priorities straight. On earth his host family called him Ian, and he had one younger sister, Belle. Though he never outright admits it, the viewer learns that he was in fact attached to his sister and to his family (his mother says he did everything he could to help out, as if he knew he wasn't going to be there forever). 

A group of enigmatic white-haired children has been spotted at different times and places in Europe for over 500 years. Always with the appearance of 11-year-olds, they behave far more mature than they should be, never grow old, and seem to have supernatural power. What they have been seeking is a girl, and the only clue they have is a picture with a crescent moon. Now, in the year of 2012, an athletic boy named Tohma is about to be involved in this centuries-long mystery.
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(Source: Anime News Network)

Extended ending showing what happened with Befort Children after the events from the last episode of the TV series. DVD release exclusive.