A busty third year student and the current leader of the Juken Club. She is very skilled in various martial arts, but does not possess the Dragon's Eye like her siblings. For this reason her father entrusted her with the cursed sword Reiki. Early in the series, she would use a body manipulation technique to revert to herself into her childhood form to conserve her ki.

Queen Vivian is the kingdom's ruler, but she likes to escape from the castle and go out, pretending to be woman named Claria.

Ringo Noyamano (野山野 林檎, Noyamano Ringo) is the female protagonist, Ikki's childhood friend, and a member of the Noyamano family that adopted Ikki into their household. However, behind her seemingly plain and unimpressive guise of a junior high school student, she is actually the successor and leader of the legendary team, Sleeping Forest. She is the current Thorn Queen of the eight "Kings" in the AT world. She helps Kogarasumaru in times of trouble under the guise of "Croissant Mask" (Croissant Kamen), Kogarasumaru's No. 1 Supporter, though Agito and Simca know who it is. She has since passed this role onto Kururu Sumeragi. Ringo is a King Class A-T Rider, wielding the techniques of Sonia Road; meaning she, using hyperventilation to fill her joints with air bubbles, employs superhuman agility while riding, at the price of suffering extreme pain while she does this.