Daisuke Yamamoto

Daisuke Yamamoto (山本 大介?) was an infant around the time of the plane he and his family were on crashed in the Amazon rainforest, leaving young Daisuke the sole survivor and grew up as a wild child, living off the land under the name of "Amazon" (アマゾン?). However, Daisuke's idyllic existence is cut short when the Ten-Faced Demon Gorgos, massacres the village in search of the powerful "GiGi Armlet", which gives the bearer fantastic power. Elder Bago, last of the Incas, gives the GiGi Armlet to Daisuke for safekeeping while using his knowledge of Incan science and magic to perform a mystical "operation" on Daisuke, transforming him into the powerful Kamen Rider Amazon before he died.