Here's some of the characters in GO Galaxy
Matatagi Hayato (Tenma's possible long lost brother behind him): A child who was once a track and field club and is proud of its speed. Although handsome, is a problem child with a dark side hidden. It has a strong fighting spirit and a sense of rivalry, and will have a conflict with Tsurugi apparently.
Sakura Nozaki (Pink Haired Girl): A girl with a flexible body that was once in the rhythmic gymnastics club. Try to be the top rhythmic gymnast and willing to work hard. However, she has a particular problem. (Remember that Tenma is originally from Okinawa and she attends Tsunami's school).
Ibuki Munemasa (White Haired Goalkeeper): A guy who used to be in the basketball club, proud of his physical strength. He was a basketball player national class, but resigned. Apparently mental reliable support Tenma.
Morimura Konoha (Green Hair Shinsuke): A shy girl who does not open his heart to others. No one knows why she was chosen for this