Mitsuzane Kureshima

"There will always be hardship and sorrow in life. But I'd rather take them upon myself than let the people I love suffer. That's why you did it.. right, Kota?"

- Mitsuzane before his first transformation.

Mitsuzane Kureshima (呉島 光実), nicknamed Mitchy (ミッチ) is Kamen Rider Ryugen (仮面ライダー龍玄 [リュウゲン]). He uses the Budou Lockseed.

Becoming Ryugen
As Kota returns from the Helheim Forest, Mai and Mitsuzane visit him. As they are wondering what happened to Kota, he tells them that he encountered a white Armored Rider (Zangetsu), who attacked him with no hesitation and thinking that he kills Yuya in the forest. He then tells them the true purpose of the Inves Game. After telling them, Kota started to feel scared after the incident as he quits the team. Mitsuzane decides to buy the Sengoku Driver from Sid, who knows his brother and the company that his father is working for. Sometime later, after Team Gaim is done dancing, Team Invitto's leader, Hideyasu Jonouchi appears as he duels them. Mitsuzane then transforms into Armored Rider Ryugen as he fights an Inves.

Inspiring Kota
After he transformed into Ryugen, he defeated Hideyasu's Inves as he gain a new Lockseed from him. Sometime later, he had a dream in which the mysterious girl tells him about the fate using the Sengoku Driver. On the next day, Mitsuzane discusses with Team Gaim about Baron's alliance with other teams until Kota appears. Kota then tells him that the Sengoku Driver is like a curse and the true purpose of using the belt, but Mitsuzane thinks that he can fight his own battles with the Sengoku Driver. Later, Kaito arrives to challenge Mitsuzane to test his strength. He transforms into Ryugen as Baron summons 2 Inves, which one of them is of a higher class. As Kota and Mai arrive, Ryugen was getting hurt as Kota tells him to retreat. However, he refused to give up when Kota and Mai is watching him fight. Kota was curious until Mai tells him that he made Mitsuzane strong which inspired him. Kota decides to fight with his own power as he transforms into Gaim and helps Ryugen. While fighting, he tells Baron that people don't use strength to show off power, instead it can inspire others to get back up. Ryugen then throws the Ichigo Lockseed to Gaim, which change him into Ichigo Arms. With the new form, Gaim and Ryugen finishes off the two Inves. Ryoji and Hideyasu then appear and transform into Armored Riders Kurokage and Gridon respectively, which shock Gaim, Ryugen and the members of Team Gaim.

Bravo and Suika
After they transform into Gridon and Kurokage, they betrayed Baron and finishes him off. Gaim and Ryugen attack the new Armored Riders and finishes them which they gain their Lockseeds. Sometimes later, in the garage, Mitsuzane tells his teammates that they could be in first place as they celebrate. Later, he returns to his home and he discovers that his brother had a Sengoku Driver in his briefcase. As he is about to walk away, Takatora stops him and wants to talk to his brother. Before they could start, Takatora got a call from his work and as he leaves the room, Mitsuzane steals the Suika Lockseed before his brother reentered the room.

When Mitsuzane and the rest of Team Gaim dancing, Oren interrupts, challenging the Armored Riders of the team to fight. Bravo quickly uses all of his winning prize Lockseeds to unleash Inves to the fight while purposely letting them running rampant. Ryugen give Gaim his stolen Suika Lockseed as he transform into Suika Arms and destroy the Inveses. But one still left and eat all of the Lockseed to become an Evolved Inves while running rampant again. Gaim Suika Arms and Ryugen (riding Sakura Hurricane) chase the rampant as they finally destroy it. Mitsuzane reveals to everyone that they are now on the top among Beat Riders as they celebrate with a cake from Charmant, much to Kota's dismay.

Inves Outbreak Part 1
While examining the Suika Lockseed, Mitsuzane exams the Lockseed that is now unresponsive as the lock loses it colors somehow after use. When Mai went missing, both Mitsuzane and Kota got a call at the same time until Kota witnesses the plants from the Helheim Forest, which was told of before to Mitsuzane and Kota goes to rescue Mai. Mitsuzane then got a call from his teammate that Sid appeared in their garage. He ushers the others out of the garage when Sid reveals he is looking for information on the Suika Lockseed. Mitsuzane admits that he stole it from his brother, but he reminds Sid that he is also a Kureshima, and makes a request of the Lock Dealer: obtaining the same Lockvehicle as Baron's (Rose Attacker) in order to enter Helheim to rescue Mai and Kota. With Gaim is at a disadvantage, Ryugen arrives in time as both finished the remaining Inveses. Once the Inves are defeated, Gaim reveals to Ryugen that the Helheim Forest is where the Lockseeds come from, prompting Ryugen to pick one off of a tree, transforming it into the Kiwi Lockseed. He and Gaim arrive in time to find Mai being protected by Baron from a Dragon Inves and assists him, as well as finding an escape portal before it closes. With the Riders managing to escape the forest with Inves following them, Ryugen covers Mai away from Gaim and Baron's battle. Ryugen and Mai witness that Baron has a Mango Lockseed to transform into Mango Arms as Gaim transformed into Pine Arms and finished off the Inves with the combination of Pine and Mango finishers. When Mai speaks about being stuck in Helheim, Mitsuzane informs them that some of Inves could break out into their world, and soon the Inves Outbreak will begin as the Riders must be involved to hunt them down for good.

At Team Gaim's garage, Mitsuzane and his teammates had a meeting about the Inves outbreaks and arranged an alliance with the other Armored Rider competitive Beat Riders. However, it failed as it wasn't their problems. Before Mitsuzane entered his home at night, he looked at the Suika Lockseed he held and noticed the color on the lock is normal, then hid it. When Takatora arrived, he told Mitsuzane to make sure the gate was locked since a Beat Rider broke in and stole something. Takatora then asked Mitsuzane about his opinion on the Beat Riders. In the morning, Mitsuzane arranged a meeting to search for the plants from Helheim that appeared in their world, but failed again, until Kota realized that the Inves only search for a fruit that is similar what happened when Banjo's fruits when he was attacked by the Inves, which gives Mitsuzane an idea to bait the Inves out. He and Kota head back to Helheim to find a premature lockseed, before Mitsuzane brought a plastic bag. Knowing the Inves would eat a matured Lockseed may transform into a massive form, according to Mitsuzane, the Lockseed transformation can only be picked by those who wears a Sengoku Driver, so Mitsuzane gave his belt and Budou Lockseed to Gaim to pick the premature Lockseed and put it in the plastic bag.

While baiting the Inves out, their plan is shortly interrupted when Gaim humiliated himself when the Inves arrived in a few minutes and had a chance to attack it. Before the Inves escaped, Ryugen attached a tracking device where the Inves currently is. Once Kota and Mitsuzane arrived at a factory where the Inves is, they witness the place is full of plants appeared around the factory and one worker was killed by it. When the Inves arrived, Mitsuzane and Kota fought back as they be able to finish off the Inves. Once the high leveled Inves is finished, Kota and Mitsuzane hide and finds out there are more Elementary Inves that have come through until the white Armored Rider called Zangetsu arrived. While watching Zangetsu fight and had his troops burned the plants from Helheim, Mitsuzane realized that Zangetsu is his brother (although he is not sure about it), as seen with the belt's faceplate. Kota snaps Mitsuzane out before the flames almost burned them, they managed to escape the factory without being spotted.

The Fateful Sengoku Movie Battle
A battle royale is being held exclusively for the Armored Riders in Zawame City. Kamen Riders Gaim, Baron, Ryugen, Kurokage, and Gridon decide to enter the competition. While fighting, a crack opens in the sky and mysterious monsters pour out from it. One of the monsters captures Mai and returns to the crack, with the Riders giving chase. Soon, they find themselves in a Warring States Period-esque world where the Kamen Riders are called Bujin (武神) and are fighting each other. The confused Kamen Rider Gaim then gets attacked by the strongest Bujin Gaim (武神鎧武).

All Armored Riders Gathering, Battle Inside Helheim Forest
Sometime later, Mitsuzane tells Kota that he would face the white Armored Rider alone, but Kota was against it. This gave him a plan of creating a new game that have Armored Riders gathering Lockseeds in the Helheim forest. As they manage to ask other teams to join the new game, they meet up Sid to buy the Lockvehicles. Before the game could start, Mitsuzane tells him that the Armored Riders will distract the white Rider including himself as Kota will see what was the scientist are doing in the forest and hoping that they would know what happened to Yuya. On the next day, the Armored Riders have gathered with Kota hiding, however Oren also arrive with a Lockvehicle. Before they could start, Inves appear to attack them. As they transform, the Armored Riders decides to go to the forest one by one, until Ryugen is alone. After all the other Riders went to the Helheim forest, Kota appears and transforms which lets Ryugen enter the forest, while Gaim distracted the Inves.

Upon entering the Helheim forest, Ryugen enters in Kiwi Arms states for an unknown reason, he is then attacked by the Inveses but managed to destroy them. He is soon encountered by Zangetsu, upon getting attacked, he is saved by the sudden appearance of Kurokage. Upon Kurokage's Sengoku Driver being accidentally destroyed, Zangetsu got a call that the Inves are attacking his researchers, which is also that Mitsuzane soon hears his family's surname, which finally confirms his brother as the white Rider. As he arrive in the ruined based camp where the researchers were, he found multiple Lockseeds and took them all as evidence for Sid. As a promise, he and Kota gives Sid a box of Lockseeds and tells him that they won't be their test subjects. Team Gaim soon celebrates Christmas Day as a victory.

Inves Outbreak Part 2
In their garage, Kota and Mitsuzane have gathered information that they learned from the forest and the connection between the Yggdrasill Corporation. After that, he tells Kota that they should never transform when Inves start to attack, so the company wouldn't get their data. Their fans approach them and ask Kota and Mitsuzane for an autograph and to see them transform, but they ignore them, until Inves attacks them. Kota transforms and finish the Inves as Mitsuzane warned him not to transform. As they see the Yggdrasill researchers, they hide and see the researchers as Kurokage and burning the plants from having people knowing the forest. Later, in Drupers, Kota thinks that they should reveal them the truth of the Inves Game, but Mitsuzane refuses and decides to keep this as a secret between them. Kota then asks why shouldn't reveal this to their team, Mitsuzane responds that he doesn't want them being in danger. Upset of learning the truth of the Inves Game, Mitsuzane thinks that their best solution is to destroy or throw away the Sengoku Driver, so their team wouldn't need to worry about them and Yggdrasill wouldn't be controlling them. As a group of Inves start to attack people, Kota transforms, but Mitsuzane tries to stop him by force. While Gaim is fighting, he was about to transform, but hesitates because of his fear of the company getting his data.

Later, Kota invite Mitsuzane and Mai to see the disease that the citizens are having. As they made to the hospital, people are starting to blame the Beat Riders for summoning Inves into their world. Kota tries to tell them that the Inves are different from theirs, but they still denies it. The head director of the hospital appears and decides to let them see the disease that they cause. They are then horrified of the disease that plants from Helhiem forest are starting to grow out of the citizens' body. Later, in their garage, they think what to do as they would try saving the citizens, but it would cause an uproar.

As Mitsuzane is about to go somewhere from his home, Takatora returns home and Mitsuzane asks him about the Yggdrasill Corporation, but his brother stops him and states he should focus on his studies. He later followed him into Yggdrasill as he sneaks in to find what are they planning. Mitsuzane then found the crack that leads the researchers to the Helheim forest, which he took a photo. Once he finds where his brother is, he finds out that Sid is working for his brother and learning about the Genesis Driver. After his brother finishes his meeting with Sid, Mitsuzane enters the room as they leave and checks their records. He watches videos of Ryoma doing some tests with the premature Lockseed to test rats, which transforms into an Inves after eating the fruit. He later then watches his former team leader, Yuya eating a premature Lockseed, which also changes him into an Inves that Gaim already defeated. After he learns that his leader was an Inves and unknowingly killed by Kota, Mitsuzane fell to the ground in disbelief.

As Mitsuzane was about to leave, he then saw Kota and Kaito being captured by the Kurokage Troopers, which compels Mitsuzane to plan some way to rescue them. He manages to find Kota's cell as he gives Mitsuzane the security card to set him free along with Kaito. While running, they arrive in the main room as Kota watches the footage of Yuya, however Mitsuzane shuts the screen before Kota could see what happened to Yuya. The alarm started to ring as the Kurokage Troopers arrive to capture them. Mitsuzane and Kaito distract the troopers as Kota has a chance to leave where the Crack is. While running from the troopers on the Lockvehicles in the tunnel, Mitsuzane transforms as Takatora was shocked by what he sees in the security footage.

After he manage to escape from the troopers, Mitsuzane and Kota visit Rat in the hospital. Rica then told them about Mai stopping the Inves Game. Later, he returns home as Takatora decides to reveal him the truth in the Helheim forest. As they arrive in the forest, Mitsuzane was horrified by what he sees and he agrees to join Yggdrasill to work with his brother.

After he joins Yggdrasill Corporation, Takatora gives him a task to retrieve the Sengoku Driver from Kota, which Mitsuzane hesitate a bit after hearing his task. In his first work at Yggdrasill, Mitsuzane (communicating via a voice changer) hires both Oren and Hideyasu in a plot to bring down Kota and orders Yoko to give them the perfected versions of their Drivers. Firstly, they made Kota's sister win in a competition where she can freely eat Oren's cakes at the Charmont. Then, Mitsuzane (again via the voice changer) tells Kota that his sister had been kidnapped and meet him at a parking lot. Oren appears and gives Kota back his sister, whom revealed to be Yoko and beats down Kota while revealing where his sister actually is.

They ordered Kota to hand over the Driver in exchange for his sister's life. As Hideyasu about to transform into Gridon and attack Akira, suddenly Oren springs the trap and knocks him unconscious. Oren ruined their plans and wanted to duel Kota. Both of them transform and fight where Gaim wins as Jimber Lemon Arms. Yoko shows up and duels with him. Mitsuzane hides nearby them and transforms, trying to perform a sneak attack on Kota but due to the moments of him with Team Gaim, this makes him also ruin the plan and fired at Marika instead, giving Kota an opening to strike. Later, Mitsuzane went to Ryoma as he covers his actions to Takatora and Ryoma started to think that he is smarter than his elder brother.

Later, his team convince the Beat Riders to participate the dance event, but they deny the offer as they blame Kaito from forming the alliance before. Sometimes later, Mitsuzane found Kota and Mai as he shows them the announcement form Bravo giving them once more begging the Beat Riders joining the event. However they still denies it as he returns to the garage and Team Baron appears to them that they will join the event to their surprise. Before the event could start, Oren appears and mock the Beat Riders as he crash the event along with the Inves on his side. While Gaim fights Bravo and his Inves, Mitsuzane is about to transform, but Zack stops him as he transform into Armored Rider Knuckle to assist Gaim. As they continue their fight, rest of the Beat Riders (less Team Red Hot) joins the event. While dancing, the music got cut off, but it doesn't stop them from dancing. After dancing, the Beat Riders celebrates as Mitsuzane thinks to himself that he can betray anything and anyone to protect the joy he witnessed.

Sometimes after the event, Mitsuzane follows Kota as he was curious where he's heading to. After following him, he visits Drupers and asks Kaito about their plan sneaking into Yggdrasill. As he hears their plan, he tells them that he will distract Yggdrasill, but he snitches on them by informing Takatora their plan so Kota wouldn't know about Yuya's fate.

Later, Ryugen along with the Kurokage Troopers fought the Inves before Ryugen finishes them off as the Crack closes. After that, Mitsuzane visit the garage and sees his team dancing with the girls from Team Invitto.

The Starting of Inves' Use for Crime
Mitsuzane met Kota at the seaside. Kota told him that he knew about Helheim's secret, but still didn't learn anything about Yuya's whereabouts. Glad and frustated, Mitsuzane talks with Takatora after giving a suggestion to Kota. The next day, he was called by Zack that there was a robbery made by Inves. Believing that there would be someone like Red Hot to use it for crime, Mitsuzane alongside Zack and Kota chase the Inves, only to find normal criminals behind the robbery. After beating up the culprits, the Inves was called to beat the Beat Riders while the criminals escaped. Mitsuzane and Zack transformed and teamed up to defeat the Inves with Double Rider Kick with Knuckle. He caught up with Gaim, only to find him beating up Sid. Angered at Sid for trying to harm Gaim but wanting to have a talk, Ryugen had no choice but to sneakily summon an Elementary Inves to help Sid escape. He came out and destroyed his own summoned Inves in the end.

Sometimes later, Kota was frustrated about learning Yggdrasill's true plan as Mitsuzane thinks that Sid is bluffing. Kota then got a call from Mai about a Crack appearing on the bridge. They arrive at the bridge as Yggdrasill's employees are guarding the area from the citizens. This gave Kota an idea of entering Helheim's forest by using the Lockvehicle to see the other side of the Crack that Mai mentioned. As they entered the forest, they notice Kaito was in there as he knew about the Scalar System from Ryoma. Mitsuzane was upset of hearing this as he was wondering what did Ryoma tell Kaito, but he leaves them. Later, they arrive where the Crack is as they notice Ryoma, along with the Kurokage Troopers and New Generation Rider Marika are guarding the Crack. As the Inves appears, the Riders started to fight them as they approach to Ryoma as they are wondering what is he planning. Ryoma told them that he was doing the same plan as Kota, which he asks him for his assistance. Kota accepts it as Mitsuzane returns back to Zawame to take his team to a shelter.

Mitsuzane went to Ryoma as he noticed that he was willing to betray Takatora when he revealed their projects. Later Mitsuzane found Kota as he revealed to him that he knew about Yuya's fate. He then told Kota not to reveal this to Mai and give up on fighting. As Gaim invades Yggdrasill, Mitsuzane was disappointed that Kota didn't listen to him. Ryoma then assigns a task to Mitsuzane to investigate Kota after seeing a Lockseed that wasn't created by him.

Kamen Rider Taisen
Mitsuzane volunteered to fight in the war between Heisei and Showa Riders. However, he was temporarily killed by a Showa Rider, turning him into a Lockseed, leading Kota, Takatora, Kaito and the Armored Riders to volunteer in the war on the Heisei side.

ToQger Vs. Kamen Rider Gaim
Ryugen arrived when there's a new trouble at Zawame where Mai and other Beat Riders perform dance show and introduced themselves as Badan Empire. Luckily a Sentai team called Ressha Sentai ToQger take out the Empire's troop when Gaim and ToQ 1gou enters the Helheim's crack portal take out the Lion Inves that was summoned by the Empire until the leader its escape. Canceling their transformation and introduce who they are, the 4 ToQger, Mitsuzane, and Mai went to Drupers as he explained everything about the Inves and Helheim origins while Kagura, Mio, and Mai are going to Charmant and shopping without paying the bill at Drupers, leaving Tokatti to pay it. He is then goes informed his brother about the existense of the infamous Badan Empire, which the brothers hasn't know anything about the evil organization. However, most of all that the Empire may have took one of Yggdrasil's data. Knowing the worst outcome would be worse than Helheim outbreak, Mitsuzane must ready for the worst threat they will be into. He is soon taking Badan Empire out until Gaim, then Baron joined in due to being interested fighting a new type of enemy. When the leader escaped again, Kota and Mitsuzane explain the existense of the Badan Empire to Kaito and want him to help them and ToQger because their are likely planning to destroy the universe, but Kaito still refused as always when they were a Beat Riders. Upon Mai getting kidnapped by Badan Empire, Mitsuzane blames ToQger for not watching over her safely, until Kota calm him down about blaming Mai's safety being kidnapped by the Empire is not just Right's fault too, Kota as well. Mitsuzane later search the Empire's location and he found it thanks to his brother. Once they found the building where Mai is kidnapped by the Empire, Mitsuzane about to make a strategy however, Right charged in without any plan accepted first until Kaito soon join in for real due to thinking if universe destroyed, the power destroyed as well. With Mitsuzane's plan becoming extend thanks to Kaito's appearance, he and Kaito as a Rider pretend they are fighting each other over their superiority to bait the leader out, while Kota and Right rescue Mai in stealth mission. Ryugen and Baron soon realize out there are two Mole Imagins in one place. With Mai is saved, Ryugen and Baron taking care of the remaining Empire's minions, while ToQger taking out the Mogura-Roid #2 and Gaim taking out the #1.

Possible Future
In a possible future, Ryugen stood by Zangetsu's side and his army of Inves and Suika Arms Armored Riders, watching the battle between Gaim and Baron's armies, assuming that his brother will know his identity.

Personality
He is a member of Team Gaim and Kota sees him as his younger brother. He is the son of a director of the Yggdrasill Corporation and attends an elite high school, a side of him which he keeps hidden from everyone. Living under his brother's shadow, he wants to live freely and break free from the path established for him, as such he sees Team Gaim as family due him being able to be himself while there.

He also respects Kota as a role model, basing his own beliefs around Kota's and always want to do more to help others. He also harbors a secret crush on Mai, which drives him to ask for a Sengoku Driver from Sid and become a rider himself, when Mai is at wit's end due to Kota being shaken to the core after the encounter with Zangetsu. After knowning that Yuya Sumii turned into Byakko Inves and for Kota as Gaim unknowingly killed him, Mitsuzane tried to hide this from Kota and even Team Gaim, trying not to disappoint his friends.

Despite having a cheerful and optimistic personality, in reality, Mitsuzane also has a dark personality. He will use his own status or a current situation for his own benefit and sake. As shown, he convinced Sid to give him the Sengoku Driver, which Mitsuzane tells Sid that one day he will surpass his brother. Mitsuzane also forced Sid to give him a Lockvehicle or else Mitsuzane would tell Takatora that Sid is the one who gave Kota the Suika Lockseed. Mitsuzane also stole the Suika Lockseed from his brother without any guilt and swears to betray anyone or everything as long he can retain his friends' happiness. Currently, only Sid, Yoko, and Ryoma know about Mitsuzane's inner darker personality.

Arms
Like with the other Armored Riders, Kamen Rider Ryugen's forms are called Arms (アームズ). All of his Chinese-themed Arms' helmets bear the suffix Men (面) as their title.

Devices

 * Sengoku Driver - Transformation device
 * Arms Weapons:
 * Budou Ryuhou - Ryugen Budou Arms' personal weapon
 * Kiwi Gekirin - Ryugen Kiwi Arms' personal weapons
 * Trigger Magnum - Ryugen Double Arms' personal weapon
 * Pine Iron - Ryugen Pine Arms' personal weapon
 * Banaspear - Ryugen Banana Arms' personal weapon
 * Melon Defender - Ryugen Melon Arms' personal weapon
 * Lockseeds - Gives access to Ryugen's form changes, depending on which arm the lock is

Vehicles

 * Sakura Hurricane - borrowed Rider Machine from Gaim
 * Rose Attacker - Ryugen's Rider Machine

List of Appearances

 * Kamen Rider Gaim
 * 1-22
 * Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle
 * Kamen Rider Gaim: Sengoku Battle Royale
 * Sengoku Movie Battle
 * Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai
 * Ressha Sentai ToQger Vs. Kamen Rider Gaim Spring Vacation Combining Special

Quotes

 * "Kota, use this." - Mitsuzane when giving Kota a Lockseed to use.
 * "Such information... shouldn't been made public." - Mitsuzane witnessing the Helheim Forest's true condition.
 * "Mai, Kota, as long as I can see these smiles, I will do anything." - Mitsuzane as he still has some chance with Team Gaim as long as he didn't betray them.

Portrayal
Mitsuzane Kureshima is portrayed by Mahiro Takasugi (高杉 真宙).

As Kamen Rider Ryugen, his suit actor is Daisuke Satō (佐藤 太輔), who was previously the suit actor for Gokai Silver in Kaizoku Sentai Gokaiger and Beet J Stag/Stag Buster in Tokumei Sentai Go-Busters.