Amazon is the protagonist of Kamen Rider Amazon. He got lost in the Amazon rainforest during a plane crash when he was a baby named Daisuke Yamamoto, before becoming a wild child. At the age of 23, he was attacked by the Geddon and was transformed into Kamen Rider Amazon so he could save the world.

Also known as Amazon Rider, Kamen Rider Amazon is different from most Showa Riders as his body is biologically altered through mutation rather than being augmented with cybernetics. Combined with his feral nature, Amazon is an animalistic berserker whose fighting style involves dismemberment of an opponent with his claws and fangs. His battlecry is "Gii-Gii-Gii-Gii" Furthermore, setting him apart from other Riders is that his design motif is based on a Monitor Lizard rather than the more typical suit basis of a grasshopper, beetle, or other insect. Along with sharp claws and teeth Amazon gains great strength and stamina which allows him to even dig his way out of ten thousand meters underground with ease. These powers were presumably more enhanced through gaining the GaGa Armlet.