Code Geass is a television series created by Sunrise, directed by Gorō Taniguchi of Planetes fame, and written by Ichirō Ōkouchi, with original character designs by Clamp and mechanical designs by Akira Yasuda (Overman King Gainer) as well as Kenji Teraoka, Junichi Akutsu and Eiji Nakata.
Code Geass is set in an alternate universe where three superpowers, the Holy Britannian Empire, the Chinese Federation, and the Europia United have divided up control of the world (with the exception of an independent Australia) and maintain a tentative balance for the first part of the series. The balance shifts in the second season as the E.U. has much of its territory conquered by Britannia while Lelouch engineers a revolution in the Chinese Federation and creates a new alliance of countries, the United Federation of Nations, reducing the number of superpowers to two.
Below are the characters found available on the site that cosplayers have depicted.