Hideyasu Jonouchi

"Do not....underestimate a pattisier. I've been training for this moment!"

- Jonouchi's entrance to aid Kaito and Minato Hideyasu Jonouchi (城乃內 秀保), more commonly referred to by his last name: "Jonouchi", is Kamen Rider Gridon (仮面ライダーグリドン), the scheming leader of Team Invitto. He uses the Donguri Lockseed.

During Gridon and Kurokage's debut, Ryoji Hase named Jonouchi's Armored Rider form Gridon, having himself disliked the name at first but he eventually accepted it as his name.

Character History
Before Ryoji battles Team Gaim, Jonouchi warns him that he couldn't win against Team Gaim.

Alliance with Team Baron
Sometime later, Kaito forms an alliance with Teams Raid Wild and Invitto as he gives them Lockseeds to win against Gaim. After Team Gaim finish dancing, Jonouchi appears as he battles the team with the Ichigo Lockseed Kaito gave him; however Mitsuzane got his own Sengoku Driver as he transformed into Armored Rider Ryugen and ended up being defeated by the new rider.

Gaining a new power
After he loses his Lockseed to Armored Rider Ryugen, Jonouchi goes to Kaito's place for a new Lockseed. As he gains a Lockseed from him, Kaito started to mock him as he is weak, which made Jonouchi question the alliance. After getting a Donguri Lockseed from Kaito, he then went to Drupers and finally understands what Ryoji says before telling him how foolish they were in allying with Baron, thus telling him that they will be Baron's slaves. Refusing to let that happen, they would need to have a chance to be on the same level as Kaito, and thus gaining Sid's attention as they received Sengoku Drivers from him. After Baron's Inves are defeated, he and Ryoji appear as they transform into Armored Riders Gridon and Kurokage respectively, which surprises Team Gaim.

First fight and confrontation with Bravo
"I am Armored Rider Kurokage" "Eh, we are naming ourselves? Then I am..." "Oh, this is Armored Rider Gridon" "What!?"

- Kurokage naming Gridon much to Team Gaim's amusement

Shortly after transforming, Ryoji announces his name as Kurokage. Realizing that they need names for their Armored forms, Jonouchi tried to think of a name only for Ryoji to name him Gridon (Much to the amusement of Team Gaim) Despite his own dislike of the name, Gridon became his official name thanks to DJ Sagara. After they transform, they easily beat up Baron, but Team Gaim's Armored Riders finish them off, also gaining their Lockseeds. Sometime later, Jonouchi and Ryoji buy replacement Lockseeds as he notices one member of Red Hot got a Sengoku Driver and a Lockseed from Sid. Later, Kurokage and Gridon were doing some training until some people arrive, thinking that there will be a battle. Oren then reveals that he announced the battle as he transforms into Armored Rider Bravo to fight Gridon and Kurokage. However, Gridon was later easily defeated by Bravo.

All Armored Riders Gathering, Battle Inside Helheim Forest
While Jonouchi was doing his job along with Ryoji during the holidays, Ryoji got a call from Kouta about the new game that Team Gaim have created. The team leaders approach Sid and ask him for Lockvehicles, but he tells them that the device won't be finished until Christmas. The next day, the team leaders have gathered, including Oren, however Inves start to attack them. As the team leaders were wondering if the Inves are part of the game, Mitsuzane tells them that the monsters are not in the game. So they transform and enter the forest one by one. Before Gridon entered the forest along with Kurokage, he gives Ryugen a "present" by throwing a Lockseed to an Inves, so they would have a chance to leave.

As he enters the forest, Gridon is already hiding from the Armored Riders, until Kurokage scared him. Kurokage tell Gridon to gather many Lockseeds as possible while he fights the Riders. As Gridon found a bunch of premature Lockseeds, Inves started to attack him, but he manages to fight back. Out of nowhere, the white Armored Rider overpowers Gridon as he tells his troops to sent Jonouchi back to the real world.

After Team Baron beats Team Raid Wild, Ryoji demanded him to fight them, but Jonouchi tells him that he originally wanted the stage where Team Raid Wild are dancing and since Ryoji's team no longer have an Armored Rider, his team have no chance of winning as Jonouchi leaves while feeling sorry for Ryoji. It is revealed that Jonouchi does really want to help Ryoji, but his fighting skill is not good enough, so he might not win against Baron. In order to train, he went to Charmant and begged Oren to teach him how to fight, which he accepts. However before that can begin, Jonouchi must work for Oren at his shop as payment, in which later during an Inves outbreak when the citizens blames on the Beat Riders for the incidents of having their relatives and friends infected and during Oren's latest interview, Jonouchi later sees this as a mixed blessing as he is not subject to threats like the other Beat Riders, which made him lucky to be under Oren's wings.

Stealing Kouta's Belt Task
After Oren becomes a Yggdrasill member, as well as Jonouchi by association, they are called by a mystery guy to set a trap on kidnapping Kouta's sister, Akira, in order to retrieve his Sengoku Driver. As he tries to torture Akira while she's eating a plate of desserts, he tries to transform, but was tricked by Oren for trying to hurt his "customer", and does so by switching Jonouchi's Donguri Lockseed with an fake that contains Oren's image, before Jonouchi, Yoko, and a mystery guy finds out what Oren up to, thus leading him to be knocked out by a frying pan.

All-Team Dance Show
Jonouchi tries to figure out which Lockseed is his own and when he chooses, it reveals to be the fake and coincidentally multiple cans fall onto him from a nearby garbage man. Oren surprises him and kicks him to the ground, where Jonouchi notices a flier for the all-team dance show, which prompts Oren to knock him down to the ground believing he has betrayed him. He later helps Oren with his propaganda against the Beat Riders. At the dance show, Jonouchi helps Oren disrupt the show with summoned Inves. When all the other teams arrive to support Team Gaim and Team Baron and begin to dance, Jonouchi turns the music off but the Beat Riders resume their dance with his own team noticing he is present and push him to the stage and put the music back on. With no choice, Jonouchi joins in with the rest of the teams to dance.

Temporarily Spread the Hate Towards Beat Riders and Aware of the City's Danger
After sometime, he and Oren appeared to try to turn the public against Zack and Peko by insisting that giving up their Inves Game is just a propaganda. However, their speech was interrupted by a swarm of Elementary Inves, which are later finished off by Oren.

After Jonouchi witnesses the Armored Riders' battle against the Inves, he finally realizes that the Inves Game ended. He sees his teammate, but she hangs out with Team Gaim's teammates as they started to make fun of Jonouchi. He started to feel bad of himself as Oren decides to take Jonouchi on a training. However Jonouchi stormed out of Charmant as he doesn't see the purpose of the training. Later, he hangs out in Drupers by himself until Kouta appears. Feeling jealous of him, Oren manage to find Jonouchi as he blames the Beat Riders. Jonouchi quickly hide as Oren reveals that he was preparing for his greatest moment of his life. He then arrives where Bravo and Gaim were fighting the Inves as Jonouchi decides to join the fray. However, Gridon blocks the attack from the Inves to protect Bravo before he faints, as he gains courage. As he gain conscious, Jonouchi informs Oren that the Inves Game actually ended.

Inves Invasion
Finally completed his training, Jonouchi and Oren arrive to aid the Riders to fight the Inves and Demushu, however the Riders were overpowered easily by the Over Lord until Kouta appears to finish off the Over Lord with his new form, Kiwami Arms.

Thanks to the communication jammer caused by Ryoma, Jonouchi, Mai and Peko are unable to watch TV and connect to the Internet about Zawame news on Inves invasion led by Over Lord. Luckily, Minato suggest the Armored Rider Alliance to use the portable communicator to be able to communicate in far range while evacuating the citizens out of Zawame safely, in which Jonouchi strongly agrees.

Jonouchi later aids Oren and Zack to battle against hundreds of Inves capturing citizens. He receives the Suika Lockseed and utilizes the Suika Arm. With the help of Bravo, he was able to crush countless Inves before reverting back to Pre-Arms.

Back in Team Gaim's garage while Oren still having duty patrolling around Zawame, he, along with the other Beat Riders hears from Kouta that Mitsuzane has been using the Beat Riders and joined a villain sides because of Ryoma and Sid's manipulation to open into darkness. But Kouta and Mai still disbelieves about Mitsuzane's current true allegiance with Over Lord.

After hearing about Ryoma's plan, Jonouchi and the others refused to cooperate at first. They were warned by Yoko to stay sharp about Ryoma. Jonouchi, along with Kouta, Kaito, and Oren follow along with Ryoma's plan and break into the Yggdrasill Tower. Gaim and Baron break into the inside of the tower while Bravo and Gridon take on the Inves remaining outside Zawame.

Jonouchi and Oren later fight Mitsuzane for Kaito to escape. However, despite being two-on-one, they were no match for him, causing them to attack with maximum power before escaping.

After Kaito's betrayal and subsequent transformation into Lord Baron, Jonouchi along with Oren and Zack discover him in the middle of Zawame accompanied by Yoko. Horrified by Kaito's ability to summon Inves without a Lockseed, Jonouchi and Oren transformed to battle him and the newly summoned Inves, although Jonouchi is intercepted by Yoko after she transforms into Marika. Despite Jonouchi's best efforts, he is no match for Yoko's superior skill, and is defeated after she is backed up by Zack when he decides to join Kaito in his quest for conquest. The resulting double-team of Knuckle and Marika results in the destruction of Jonouchi's Donguri Lockseed, though Kaito spares both him and Oren in order to deliver a warning to the others.

Personality
Jonouchi is a calm-looking person and is a brilliant tactician, forming strategies of attack when the best means of winning are not available. This is shown when he attacks Team Gaim when Kouta is not around and suggesting he and Ryoji get their own Sengoku Drivers. Despite his confidence in strategy, he has no actual combat skills after becoming an Armored Rider due to his inexperience. This is proven during his battles against Ryugen and Bravo when he became a human shield for Kurokage. He is also a coward, hiding as Kurokage was being beaten by Bravo and preferring sneaky tactics. He is not very confident about going against long-range weapon Armored Riders like Ryugen and prefers to hide from gunfire. When everything is changed at the end of the Inves Game and a sudden appearance of the endless Inves come out of nowhere for the outbreak while seeing most of the Armored Riders trying to sacrifice themselves to defend the city, Jonouchi finally awakened his fighting spirit, overcoming his cowardliness. After completing his training, Jonouchi joins forces with the other Beat Riders in defending the city against the Inves invasion. His bravery was indeed getting stronger as he was willing to take on dozens of Inves along with Oren despite knowing that they have no chance of winning.

Arms
As with the other Armored Riders that uses Lockseeds, Kamen Rider Gridon's forms are called Arms (アームズ).

Devices

 * Sengoku Driver - Transformation device (Originally used the prototype version but later switched to the mass production version, until the latter was destroyed by Marika and Knuckle)
 * Lockseeds - Gives access to Gridon's Arms changes, depending on which lock is used

Weapons

 * Arms Weapons - Weapons that come with the Arms:
 * Donkachi - Gridon Donguri Arms' personal weapon
 * Kagematsu - Gridon Matsubokkuri Arms' personal weapon
 * Kurumi Bombers - Gridon Kurumi Arms' personal weapon
 * Trigger Magnum - Gridon Double Arms' personal weapon

Vehicles

 * Lock Vehicles - Vehicles that unfold from special Lockseeds:
 * Rose Attacker - Kamen Rider Gridon's Rider Machine

List of Appearances

 * Kamen Rider Gaim
 * 3-7, 10-13, 17, 18, 20, 25, 32-34, 36-39, 41
 * Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle
 * Kamen Rider Gaim: Sengoku Movie Battle
 * Kamen Rider Gaim the Movie: The Great Soccer Match! The Golden Fruit Cup!

Portrayal
Hideyasu Jonouchi is portrayed by Ryō Matsuda (松田 凌).

As Kamen Rider Gridon, his suit actor is Kazuya Okada (岡田 和也), who was previously the suit actor for Gremlin in Kamen Rider Wizard.

Legend Rider Lockseeds

 * The following Legend Rider Lockseeds are styled for Gridon, as well as Baron:
 * Black RX - "Son of the Sun!"
 * Blade - "Sword of Spade!"
 * Kiva - "King of the Vampire!"
 * OOO - "Tatoba, Ta~To~Ba!"
 * OOO Tajadol Combo - "Ta~Ja, Ta~Ja~Dol!"
 * OOO Putotyra Combo - "Pu-To-Tyranno~Sau~rus!"
 * Ankh - "Happy Birth~Day!"