Gameru is a ninja who possesses one of Iou039s prototype ninja tools Dako. Him along with Kusune came to Iou to get ninja tools but he refused to give some to outsiders. Gameru and Kusune fight Naruto Uzumaki and Neji Hyga who are no match against Iou039s ninja tools. When Iou gives Tenten his latest invention Jidanda Tenten easily defeats the two. source: Narutopedia