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The Gravity Children (重力子, Jūryokushi?) is not actually a team but rather the self-given name of the genetically modified children who escaped the underground laboratory. The members include every king with the exception of Ine Makigami, Yoshitsune, Akito/Agito, Akira Udou, Kazu, and Rika. The original kings, Falco, Black Burn, Spitfire, Dontores, Kilik, Sora, and the current Sleeping Forest members Ringo, Ume, Mikan, Om, Gabishi and the two unidentified kings are also Gravity Children. Simca, Rune and Sora's twin brother, the current Gem king Nike are also members. Nue, the current Thunder King, later reveals his identity as a Gravity Child along with all the members of his team, when they are present to hear Spitfire's final recorded words. There are speculations that Ikki may also be one of the Gravity Children, but that is yet to be confirmed.Orca is also a gravity child.

The Gravity Children are distinguished by cross-shaped marks on their pupils.

(Pretty much saying almost all of the original kings were 'Gravity Children')