Hideyasu Jonouchi is Kamen Rider Gridon, the scheming leader of Team Invitto and a minor antagonist turned supporting character in Kamen Rider Gaim. He uses the Donguri Lockseed. During Gridon and Kurokage's debut, Ryoji Hase named Hideyasu's Armored Rider form Gridon, having himself disliked the name at first but he eventually accepted it as his name.