Gameru

is a ninja who possesses one of Iō's prototype ninja tool Dako.

Konoha Histoy Arc
Along with his partner Kusune, they went to Iō to get ninja tools but he refused to give his tools to outsiders. Gameru and Kusune fought Naruto Uzumaki and Neji Hyūga who were no match against Iō's ninja tools. When Iō lend Tenten of his latest invention, Jidanda, Tenten easily defeated them.