As with the other Sengoku and Genesis Riders, Kamen Rider Ryugen's forms are called Arms (アームズ Āmuzu). His personal Lockseeds are styled either dividing into three parts or ending with a fighting grunt ("Ha-Ha-Ha" or "Sei-ya Ha"). As Ryugen, all of Ryugen's Chinese Soldier-themed Arms' helmets share the suffix Men (面 lit. "Face") as their title, while his visors are called Ryugan (龍眼 Ryūgan, lit. "Dragon Eye". Doubles as a pun on "Japanese Longan").

As Kamen Rider Ryugen, Haruna's Sengoku Driver plays Chinese erhu & gong music and announces "Hai" (ハイー Haī) before every transformation. By pressing the Sengoku Driver's Cutting Blade down on the Lockseed after transforming from one to three times, she can activate one of three finishing moves based on her current Arms form:

　・Squash (スカッシュ Sukasshu)
　・Au Lait (オーレ Ōre)
　・Sparking (スパーキング Supākingu)

All of Haruka's main forms and their armaments utilize Kanji instead of Hiragana or Katakana.

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Ride Wear
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The Ride Wear (ライドウェア Raido Uēa) is Ryugen's undersuit, which is briefly seen during Ryugen's transformation sequence before the attaches or when he changes Arms. However, this form is completely vulnerable to any incoming attacks when shot at directly in the suit rather than at the Arms that is descending down on the Rider.

The Ride Wear that Ryugen's has is easily identifiable through its Rider Indicator (ライダーインジケーター Raidā Injikētā) faceplate. The Rider Indicator only identifies what Ride Wear a Sengoku Driver contains for simplicity and can be replaced with extensions such as the Genesis Core or Senyo Joint.

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Standard Arms
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・Budou Arms

"Hai! (Chinese percussion) Budou Arms: Ryu, Hou, Ha, Ha, Ha! (Chinese cymbals)"
－Transformation announcement－

Rider Statistics

・Height: 206 cm.
・Weight: 105 kg.

Ability Perimeters

・Punching Power: 6.7 t.
・Kicking Power: 10.2 t.
・Maximum Jump Height: 28 m.
・Maximum Running Speed: 100 m. per 5.9. sec.

Budou Arms (ブドウアームズ Budou Āmuzu, lit. "Grape Arms") is Ryugen's grape-based armored default form. Accessed through the Budou Lockseed, this form bears the Syoryumen (招龍面 Shōryūmen, lit. "Summoned Dragon Face") helmet.

While assuming Budou Arms, Ryugen dons the Budou Armor Part (ブドウアーマーパート Budou Āmā Pāto, lit. "Grape Armor Part") and her primary Arms Weapon is the Budou Ryuhou. If Ryugen activates her Sengoku Driver's Sparking function, she can temporarily convert the Budou Armor Part into its fruit form and spin it to use as a shield for bouncing off enemy attacks.

In this form, Ryugen's statistics are the same as Gaim's Orange Arms, making Ryugen, in theory, a good substitution for Gaim. However, the downside of this form is that, as a gunslinger, it lacks close combat abilities.

Kamen Rider Ryugen Budou Arms can perform her following finishers:

　・Ryugen Kyaku (龍玄脚 lit. "Dragon Mystery Kick"): Ryugen activates the Squash function on her Sengoku Driver and jumps into the air while purple energy surrounds her right foot that releases grape-shaped energy as he strikes the target with a powerful kick.

　・Drago Shot (ドラゴンショット Doragon Shotto): This finisher has two variations depending on which function Ryugen activates from his Sengoku Driver.

　　・Squash: Ryugen pulls the hammer once, making violet-hued energy shaped after grapes expel from the sides of the Budou Ryuhou, with golden Asian lung energy coils circling the barrel. The energy balls then move to the muzzle of the gun, pooling into one big sphere. Once the charge is complete, seconds before the trigger is pulled, the ball takes the form of an Asian lung's head, and shots are fired at high speeds, with each shot taking the form of a flying Asian lung.
　　・Au Lait: Ryugen pulls the hammer twice
　　・Sparking: Ryugen shoots a more powerful version of the original Dragon Shot, though changed somewhat, as the Asian lung takes form and races over to the target.

・Kiwi Arms

"Hai! Kiwi Arms: Geki, Rin, Sei-ya Ha!"
－Transformation announcement－

Rider Statistics

・Height: 206 cm.
・Weight: 100 kg.

Ability Perimeters

・Punching Power: 8.4 t.
・Kicking Power: 11.8 t.
・Maximum Jump Height: 28 m.
・Maximum Running Speed: 100 m. per 5.7. sec.

Kiwi Arms (キウィアームズ Kiui Āmuzu) is Ryugen's kiwi-based form. Accessed through the Kiwi Lockseed, this form bears the Kiuimen (急威面 lit. "Urgent Domination Face". Doubles as a pun on "Kiwi") helmet.

While assuming Kiwi Arms, Ryugen dons the Kiwi Armor Part (キウィアーマーパート Kiui Āmā Pāto) and her primary Arms Weapon is the Kiwi Gekirin.

In this form, Ryugen's offensive stats have increased enough to almost rival Baron in Banana Arms, making him very dangerous to face against with his Kiwi Gekirin in hand, and unlike other Arm Changes of similar caliber (such as Gaim's Pine Arms and Baron's Mango Arms), Ryugen's jumping height in Kiwi Arms hasn't taken a hit, allowing him to jump as well as she could in Budou Arms, as well as a slightly faster running speed, though this can be easily looked over.

Kamen Rider Ryugen Kiwi Arms can perform her following finishers:

　・Spinning Hoop (龍玄脚 lit. "Dragon Mystery Kick"): Ryugen activates the Squash function on her Sengoku Driver and jumps into the air while purple energy surrounds her right foot that releases grape-shaped energy as he strikes the target with a powerful kick.

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Super Forms
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・Jimber Dragon Arms

"Hai! Mix! (Chinese percussion) Budou Arms: Ryu, Hou, Ha, Ha, Ha! (Chinese cymbals) Jimber Dragon! Ha-Ha!"
－initial transformation announcement－

"Hai! Mix: Jimber Dragon! Ha-Ha!"
－Standard transformation announcement－

Fanart Version

S.I.C. Version

Rider Statistics

・Height:
・Weight:

Ability Perimeters

・Punching Power:
・Kicking Power:
・Maximum Jump Height:
・Maximum Running Speed:

Jimber Dragon Arms (ジンバードラゴンアームズ Jinbā Doragon Āmuzu) is Ryugen's grape/pitaya-based fusion form, which is accessed through the simultaneous use of the Budou Lockseed and Dragon Fruits Energy Lockseed via the Genesis Core replacing his Sengoku Driver's Rider Indicator.

While assuming Jimber Dragon Arms, Ryugen dons the Jimber Armor Part (ジンバーアーマーパート Jinbā Āmā Pāto) and bears the Syoryumen (ジンバー招龍面 Jinbā Shōryūmen, lit. "Jimber Summoned Dragon Face") helmet. His Arms Weapon is the Sonic Arrow.

In this form, his power has been increased exponentially, which allows her to put on par with the Genesis Riders. He has more attack power than Gaim's Jimber Arms since he has used the most powerful Energy Lockseed. However, his maximum jumping height is slightly lower than the jumping height in Budou Arms due to the cumbersome armor, which incidentally resembles a "jinbaori" (陣羽織), a type of haori specifically made for armored samurai to wear. If Ryugen suffers an attack which deals heavy damage, he will revert back to Budou Arms.

Kamen Rider Ryugen Jimber Dragon Arms can perform his following finishers:

　・Unnamed Rider Slash: Ryugen activates the Au Lait function on his Sengoku Driver and fuels all the energy from the Budou Lockseed and Dragon Fruits Energy Lockseed into her body, which is then converted into her Sonic Arrow before he executes a spinning dragonfruit projectile slash on the target.

　・Sonic Volley (ソニックボレー Sonikku Borē): Ryugen locks the Dragon Fruits Energy Lockseed into the Sonic Arrow and activates the Squash function on her Sengoku Driver before fires a powerful arrow shot that when it hits a target forms an Asian lung energy for a brief second before exploding.