Kamen Rider Gridon is a fictional armored Rider from the tokusatsu series Kamen Rider Gaim. He is the transformation identity of Hideyasu Jonouchi, a minor but memorable supporting character who begins as a comic, insecure team member and gradually becomes more determined. Gridon fights using acorn-themed armor and a spear-like weapon, often serving as a symbol of underdog persistence. His role in the series is to provide both humor and emotional contrast while also taking part in the larger conflict over the Lockseeds and the Helheim invasion.