As with the other Sengoku and Genesis Riders, Kamen Rider Gaim's forms are called Arms (アームズ Āmuzu). His Sengoku Driver plays Japanese horagai music and announces "Soiya" (ソイヤ) before every transformation, except when he transforms into Kiwami Arms, while his personal Lockseeds are styled with a mix of Japanese words and English words. With the exception of Suika Arms, all of Gaim's Japanese Samurai, Ninja and Shogun-themed Arms' share the title Kabuto (カブト lit. "Helmet"), while his visors are called Pulp Eye (パルプアイ Parupu Ai).

By pressing the Sengoku Driver's Cutting Blade down on the Lockseed after transforming from one to three times, Gaim can activate one of three finishing moves based on his current Arms form:

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

In addition to the Sengoku Driver's finishing moves, Gaim can perform either a Fruits Charge (フルーツチャージ Furūtsu Chāji) or Sonic Volley (ソニックボレー Sonikku Borē) finishing attack by inserting a Lockseed into the attachment slot of either his Musou Saber, Sonic Arrow, or DJ-Ju.

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Ride Wear(s)
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・ Standard Ride Wear

The Ride Wear (ライドウェア Raido Uēa) is Gaim's undersuit, which is briefly seen during Gaim'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 of Gaim consists of the following parts:

　・Front Blade (フロントブレード Furonto Burēdo) is the part which corresponds to the helmet's placket. It is a type of armor added to protect the eyebrows which is the main point of the human body.
　・Byakugou Signal (ビャクゴウシグナル Byakugou Shigunaru) is a special ore like quartz, installed inside the center of the Front Blade. It has the property of responding to electromagnetic waves, magnetic force, various kinds of radio waves, etc. and fulfills the role of sensor.
　・War Crusher (ウォークラッシャー U~ō Kurasshā) is the armor to protect the part of the jaw. Since it also serves as an air intake port, take in outside air from here and take it inside after passing a special filter that removes toxic substances.
　・Ride Wear (ライドウェア Raido U~ea) is the under suits wearing under armor. It is controlled by the Sengoku Driver, protecting the Rider by covering the whole body of the user, and improving the basic physical ability greatly.
　・Kenraikou (ケンライコウ Kenraikou) is the gauntlets protecting the arms of the Rider, a thin metal plate is like a scalp, and the strength is greatly improved without disturbing the movement of the arm.
　・Gourairin (ゴウライリン Gourairin) is the golden power amplifying device installed around the wrist that strengthens the punching power of a Rider. In response to the will of the wearer, the Sengoku Driver performs output control and releases the power.
　・Shugenkou (シュゲンコウ Shugenkou) is a type of glove that protects the fingers and palm of a Rider. Because it is extremely thin but strong, it can even guard a sharp knife.
　・Kensokutai (ケンソクタイ Kensokutai) is a very thin armor which is braided in Ride Wear. It protects thighs from slashing and shooting.
　・Kensokugai (ケンソクガイ Kensokugai) is the armor to protect knee joints of a Rider. It is thin and compact enough to not impede the movement of the joint but strength is sufficiently secured. Also, the knee kicks from the high kicking power Rider is a powerful weapon.
　・Gouraitai (ゴウライタイ Gouraitai) is Y-shaped guard protecting the legs of a Rider and strengthen kicking strength. Also, it can absorb the impact when jumping off from a high place, and the reaction of kicking.
　・Shipuka (シップウカ Shippuuka) is the armor part covering the forefoot of a Rider. Normally it is flexible like rubber but it reacts with impact and hardens in a flash, so its strength is extremely high.

Gaim is distinct among the Sengoku Riders in that he is equipped with a Lockseed Holder on the right side of his Sengoku Driver, which is used to carry his first three Lockseeds (Orange, Pine, and Ichigo). He is also one of only a selected few Sengoku Riders who are defaultly equipped with a side weapon, which is held on the left side of his Sengoku Driver with a Musou Saber Holster.

The Ride Wear that Gaim's Sengoku Driver 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 Unit or Senyo Joint.

In the case of Gaim, it has been shown that certain Arms which are particularly unique and powerful can make minor modifications to the Ride Wear as part of the Arms Change.

　・When Gaim assumes a Jimber Arms, his Ride Wear becomes the Jimber Ride Wear (ジンバーライドウェア Jinba Raido Uēa), which is almost exactly identical to his regularRide Wear with the exception of Gaim's helmet crest turning silver andmouth-plate turning black.

　・When Gaim assumes Kachidoki Arms, his Ride Wear becomes the Kachidoki Ride Wear (カチドキライドウェア Kachidoki Raido Uēa, lit. "Triumph Ride Wear").

　・When Gaim assumes Kiwami Arms, his Kachidoki Ride Wear becomes purged toreveal a silver-colored undersuit known as the Kiwami Ride Wear (キワミライドウェア Kiwami Raido Uēa, lit. "Extreme Ride Wear"). In this form,the Musou Saber and its holster are replaced with a second Lockseed Holder that carries Gaim's three Energy Lockseeds (Lemon Energy, Cherry Energy, and PeachEnergy).

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Standard Arms
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・Orange Arms

"Soiya! Orange Arms: Hanamichi [To The Blossomed Path] On Stage!"
ーTransformation announcementー

Rider Statistics:

　・Height: 203 cm.
　・Weight: 105 kg.

Ability Parameters:

　・Punching Power: 6.7 t.
　・Kicking Power: 10.2 t .
　　・Burai Kick: 25 t.
　・Maximum Jump Height: 28 m.
　・Maximum Running Speed: 100 m per 5.9 sec.

Orange Arms (オレンジアームズ Orenji Āmuzu) is Gaim's orange-based default form. Accessed through the Orange Lockseed, this form bears the Dai Kabuto (ダイカブト lit. "Orange Helmet") helmet.

While assuming Orange Arms, Gaim dons the Orange Armor Part (オレンジアーマーパート Orenji Āmā Pāto) and his Arms Weapon is the Daidaimaru. If Gaim activates his Sengoku Driver's Sparking function, he can temporarily convert the Orange Armor Part into its fruit form and spin it to use as a shield for bouncing off enemy attacks.

This form is Gaim's most balanced form. Because of that, Gaim often uses this form, due to it's not suffering from any significantly statistic power up or down.

The Orange Armor Part consists of the following parts:

　・Dai Kabuto (ダイカブト Dai Kabuto) is the helmet to protect the head of a Rider.

　　・Peak Stem (ピークステム Pīku Sutemu) is an analysis unit installed on the top of the head that monitors the wearer's biological information. It reads heart rate and physical or mental damage and try to cooperate with the Sengoku Driver so that the wearer's combat ability can be maximized.
　　・Pulp Eye (パルプアイ Parupu Ai) is the visual line sensor section of a Rider. A myriad of small camera eyes is arranged radially and can be caught far beyond the human visual range.
　　・Reversal Arm (リバーサルアーム Ribāsaru Āmu) is a type of armor that protects the head, installed on the two sides of Pulp Eye. It has a role of receiving damage attacked to the head laterally to reduce damage.
　　・Multi Dai Armor (マルチダイアーマー Maruchi Dai Āmā) are multiple armors made by stacking several sheets of metal, installed on the back of the head. Because the armor is repulsive due to the electromagnetic force, it escapes pressure like a cushion and it greatly increases the durability to offset the damage the armor itself received.

　・Dai Lung (ダイラング Dai Rangu) is the armor to protect the chest of a Rider. It boasts enough strength to scratch even if it is slashed with a sharp sword.

　・Dai Sleeve (ダイスリーブ Dai Surību) is the armor to protect the shoulder of a Rider. By taking two folded structures, it will mitigate wearer damage and protect the Rider.

Kamen Rider Gaim Orange Arms can perform his following finishers:

　・Burai Kick (無頼キック Burai Kikku): Gaim activates the Squash function on his Sengoku Driver and jumps into the air, engulfed by an orange energy passing through a line of orange slices with a high concentration of orange energy focused on his right foot as he strikes the target with a powerful kick. Alternatively, if Gaim performs the Burai Kick from a long distance away, the line of orange slices do not appear.

　・Daidai Ittou (大橙一刀 lit. "Great Orange Sword Strike"): Gaim activates the Squash function on his Sengoku Driver and charges his Daidaimaru with energy before unleashing a series of slashes on the target. This finisher has two variations; a straight slash for a single target and a circle version for multiple targets.

　・Orange Musou Zan (オレンジ無双斬 Orenji Musō Zan, lit. "Orange Unrivaled Slash"): Gaim locks the Orange Lockseed into the Musou Saber and charges the weapon with orange-shaped energy producing an effect of sparks around it before he slashes the enemy.

　・Naginata Musou Slicer (ナギナタ無双スライサー Naginata Musō Suraisā): Gaim locks the Orange Lockseed into the Daidaimaru Naginata Mode and fires energy slashes from the Musou Saber end at the enemy, trapping them in an orange sphere. Afterwards, he charges the Daidaimaru end with energy before slashing the enemy with it. The Orange Charge has two variations for close-quarters combat; a multiple slash version for separate targets and a 360 degree turn slash version that forms orange slices on contact with the target.

・Pine Arms

"Soiya! Pine Arms: Funsai [Pulverization] Destroy!"
ーTransformation announcementー

Rider Statistics:

　・Height: 206 cm.
　・Weight: 119 kg.

Ability Parameters:

　・Punching Power: 8.7 t.
　・Kicking Power: 10.2 t.
　・Maximum Jump Height: 22 m.
　・Maximum Running Speed: 100 m per 6.5 sec.

Pine Arms (パインアームズ Pain Āmuzu, short for "Pineapple Arms") is Gaim's pineapple-based form. Accessed through the Pine Lockseed, this form bears the Spine Kabuto (スパインカブト Supain Kabuto, lit. "Spine Helmet") helmet.

While assuming Pine Arms, Gaim dons the Pine Armor Part (パインアーマーパート Pain Āmā Pāto, short for "Pineapple Armor Part") and his Arms Weapon is the Pine Iron.

In this form, Gaim becomes a little more powerful than Orange Arms. However, only the punching power increases, while the kicking power remains the same. His maximum jump height and running speed also decrease. However, in this form, Gaim achieves more defense than he had in Orange Arms.

Kamen Rider Gaim Pine Arms can perform his following finishers:

　・Burai Kick (無頼キック Burai Kikku): Gaim activates the Squash function on his Sengoku Driver and jumps into the air, engulfed by an yellow energy passing through a line of pine slices with a high concentration of orange energy focused on his right foot as he strikes the target with a powerful kick. Alternatively, if Gaim performs the Burai Kick from a long distance away, the line of pine slices do not appear.

　・Iron Breaker (アイアンブレイカー Aian Bureikā): Gaim activates the Squash function on his Sengoku Driver and executes one of four variations of this attack.
　　・Gaim throws/kicks the Pine Iron at the opponent, growing it if he needs it to. Once the Pine Iron is attached to the opponent's head, he strikes the target with a powerful side kick.　　・Gaim launches the Pine iron to encase the target in a pine aura passes through a line of slices of pine and slams into the target with a powerful side kick. If the Pine Iron is unavailable or is already being used, Gaim just passes through the line of pine slices and kicks the target as usual.
　　・Gaim swings and restrains the opponent with the Pine Iron in close range, then he floats into sky, passes through the line of pine slices and kicks the target.
　　・It can be used without the side kick, causing the Pine Iron to become an explosive projectile instead of attaching to the target's head. When used in conjunction with Mango Au Lait, the Pine Iron expands on the target's head, mixed with Mango energy and crushes the target.

　・Pine Musou Zan (パイン無双斬 Pain Musō Zan, lit. "Pineapple Unrivaled Slash"): Gaim activates the Au Lait function on his Sengoku Driver, restrains the opponent with the Pine Iron and charges the Musou Saber with pineapple-shaped energy before slashing the enemy.

・Ichigo Arms

"Soiya! Ichigo Arms: Shushutto Spark!"
ーTransformation announcementー

Rider Statistics:

　・Height: 206 cm.
　・Weight: 100 kg.

Ability Parameters:

　・Punching Power: 6 t.
　・Kicking Power: 10.2 t.
　・Maximum Jump Height: 33 m.
　・Maximum Running Speed: 100 m per 5.5 sec.

Ichigo Arms (イチゴアームズ Ichigo Āmuzu, lit. "Strawberry Arms") is Gaim's strawberry-based armored form. Accessed through the Ichigo Lockseed, this form bears the Berry Kabuto (ツブテカブト Tsubute Kabuto, lit. "Berry Helmet") helmet.

While assuming Ichigo Arms, Gaim dons the Ichigo Armor Part (イチゴアーマーパート Ichigo Āmā Pāto, lit. "Strawberry Armor Part") and his Arms Weapon is the Ichigo Kunai.

In this form, Gaim has less punching power than even Orange Arms. However, like his other forms, his kicking power is unaffected. What he gains in this form is slightly faster running speed and higher max jumping height when compared to Orange Arms.

Kamen Rider Gaim Ichigo Arms can perform his following finishers:

　・Burai Kick (無頼キック Burai Kikku): Gaim activates the Squash function on his Sengoku Driver and jumps into the air, engulfed by an red energy passing through a line of strawberry slices with a high concentration of red energy focused on his right foot as he strikes the target with a powerful kick. Alternatively, if Gaim performs the Burai Kick from a long distance away, the line of strawberry slices do not appear.

　・Kunai Burst (アイアンブレイカー Aian Bureikā): Gaim locks the Ichigo Lockseed into the Musou Saber and unleashes a giant energy-shaped strawberry that explodes into countless amounts of kunai that rain down on the enemy. This can be done in multiple swings.

・Suika Arms

"Soiya! Suika Arms: Odama [Big Ball] Big Bang! (Bowling pins falling)"
ーTransformation announcementー

"Yoroi/Odama/Gyro Mode!"
ーMode change announcementー

Yoroi Mode

Odama Mode

Gyro Mode

Rider Statistics:

　・Rider Height: 311 cm.
　・Rider Weight: 523 kg.

Ability Parameters:

　・Punching Power: 33.2 t.
　・Kicking Power: 51.8 t.
　・Maximum Jump Height: 3 m.
　・Maximum Running Speed: 100 m per 9.8 sec.

Gyro Mode Statistics:

　・Height: 237 cm.
　・Width: 413 cm.
　・Weight: 523 kg.
　・Maximum flight speed: 247 km/h.

Suika Arms (スイカアームズ Suika Āmuzu, lit. "Watermelon Arms") is Gaim's watermelon-based mecha form. Accessed through the Suika Lockseed, this form bears the Suika Head (スイカヘッド Suika Heddo, lit. "Watermelon Head") helmet with an unspecified visor.

While assuming Suika Arms, Gaim dons the Suika Armor Part (スイカアーマーパート Suika Āmā Pāto, lit. "Watermelon Armor Part") and his Arms Weapon is the Suika Sojinto. This form can also interchange into three modes.

　・Yoroi Mode (ヨロイモード Yoroi Mōdo, lit. "Armored Mode"): Suika Arms' warrior mode, which equips Gaim with the Suika Sojinto for combat.
　・Odama Mode (大玉モード Ōdama Mōdo, lit. "Big Ball Mode"): Suika Arms' watermelon mode, which encases Gaim's entire body to use either for offensive/defensive purposes or as a mode of transportation.
　・Gyro Mode (ジャイロモード Jairo Mōdo): Suika Arms' flight mode, which allows Gaim to fire seed-like bullets from the fingertips.

Suika Arms is the most massive Arms Change, and it shows by having the most monstrous punching and kicking power once in Yoroi Mode. Consequentially, it also has the worst jumping height in all of Rider history, and any Rider can practically outrun it. Though this is rendered moot thanks to Odama Mode and Gyro Mode. Also, after a utilization, the Suika Lockseed's color becomes grey, indicating that its energy is low and needs time to recharge back to its green color before it can be used again.

Kamen Rider Gaim Suika Arms can perform his following finishers:

　・Twin-Bladed Slice (双刃割り Sōba-wari): Gaim activates the Squash function on his Sengoku Driver and executes one of two variations of this attack.
　　・Gaim traps the target in a watermelon energy ball. Then, he slashes the "watermelon" all over until the energy ball blows up, raining fire and "watermelon flesh" as the target is destroyed.
　　・Gaim traps the target in a watermelon energy ball before striking it with a single slash, causing the energy ball to blow up and rain fire and "watermelon flesh" as the target is destroyed.

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Jimber Arms
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The Jimber Arms (ジンバーアームズ, Jinbā Āmuzu) are upgraded versions of Gaim's Orange Arms that he can access by replacing his Sengoku Driver's Rider Indicator with the Genesis Driver's Genesis Core and inserting an Energy Lockseed into it. In these forms, Gaim dons the Jimber Armor Part (ジンバーアーマーパート Jinbā Āmā Pāto) where he bears Jimber Kabuto (ジンバーカブト Jinbā Kabuto, lit. "Jimber Helmet") helmet and his Arms Weapon is the Sonic Arrow (excluding for Jimber Matsubokkuri Arms whose its Arms Weapon is Kagematsu Shin instead). Even though all five Jimber Arms share the exact same stats, each form has its own enhanced skill.

In these forms, his power has dramatically increased, allowed him to keep up and fight against White Clothes' Kamen Riders. However, his maximum jumping height is slightly lower than the jumping height in Orange 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 Gaim suffers an attack which deals heavy damage, he will revert back to Orange Arms.

・Jimber Lemon Arms

"Soiya! Mix! Orange Arms: Hanamichi [To The Blossomed Path] On Stage! Jimber Lemon! Ha-Ha!"
ーTransformation announcementー

"Soiya! Mix: Jimber Lemon! Ha-Ha!"
ーShortened transformation announcementー

Rider Statistics:

　・Height: 206 cm
　・Weight: 110 kg.

Ability Parameters:

　・Punching Power: 13.7 t.
　・Kicking Power: 17.9 t.
　・Maximum Jump Height: 25 m.
　・Maximum Running Speed: 100 m per 5.6 sec.

Jimber Lemon Arms (ジンバーレモンアームズ Jinbā Remon Āmuzu) is Gaim's orange/lemon-based fusion form, which is accessed through the simultaneous use of the Orange Lockseed and Lemon Energy Lockseed.

The enhanced skill of this Jimber Arms is strength, allowing Gaim to receive an extra boost in power. Because of this, it is the most suited for close combat among the Jimber Arms, making this form as Gaim's primary Jimber Arms.

Kamen Rider Gaim Jimber Lemon Arms can perform his following finishers:

　・Burai Kick (無頼キック Burai Kikku): Gaim activates the Squash function on his Sengoku Driver and floats into the air and spins around. Afterwards, he uses the Sonic Arrow, powered by the Orange Lockseed, to create an alternating row of lemon slices and orange slices, which appear in a line in front of the target. Gaim, powered by the Lemon Energy Lockseed, then initiates a powerful kick by leaping through the line of slices and passing through each one before he hits the target.

　・Unnamed Rider Slash: Gaim activates the Au Lait function on his Sengoku Driver and fuels all the energy from the Orange Lockseed and Lemon Energy Lockseed into his body, which is then converted into his Sonic Arrow before he executes a spinning lemon projectile slash on the target.

　・Unnamed Rider Shooting: Gaim locks the Lemon Energy Lockseed into the Sonic Arrow, activates the Squash function on his Sengoku Driver and pulls the Sonic Arrow back to its fullest width. All the energy then pools into the arrowhead of the Sonic Arrow, making an alternating row of orange slices and lemon slices appear to form a line in front of the target. Once the charge is done, he lets go, sending a bolt of great power, fueled by the power of both the Orange Lockseed and Lemon Energy Lockseed to pass through the line of slices, slamming into the target. Alternatively, if the target is within a close-quarters radius, the alternating row of slices will not appear.

・Jimber Cherry Arms

"Soiya! Mix! Orange Arms: Hanamichi [To The Blossomed Path] On Stage! Jimber Cherry! Ha-Ha!"
ーTransformation announcementー

"Soiya! Mix: Jimber Cherry! Ha-Ha!"
ーShortened transformation announcementー

Rider Statistics:

　・Height: 206 cm
　・Weight: 110 kg.

Ability Parameters:

　・Punching Power: 13.7 t.
　・Kicking Power: 17.9 t.
　・Maximum Jump Height: 25 m.
　・Maximum Running Speed: 100 m per 5.6 sec.

Jimber Cherry Arms (ジンバーチェリーアームズ Jinbā Cherī Āmuzu) is Gaim's orange/cherry-based fusion form, which is accessed through the simultaneous use of the Orange Lockseed and Cherry Energy Lockseed.

The enhanced skill of this Jimber Arms is speed, allowing Gaim to move at a blinding pace. Because of this, it can be used either to defeat hordes of enemies or as a quick getaway.

・Jimber Peach Arms

"Soiya! Mix! Orange Arms: Hanamichi [To The Blossomed Path] On Stage! Jimber Peach! Ha-Ha!"
ーTransformation announcementー

"Soiya! Mix: Jimber Peach! Ha-Ha!"
ーShortened transformation announcementー

Rider Statistics:

　・Height: 206 cm
　・Weight: 110 kg.

Ability Parameters:

　・Punching Power: 13.7 t.
　・Kicking Power: 17.9 t.
　・Maximum Jump Height: 25 m.
　・Maximum Running Speed: 100 m per 5.6 sec.

Jimber Peach Arms (ジンバーピーチアームズ Jinbā Pīchi Āmuzu) is Gaim's orange/peach-based fusion form, which is accessed through the simultaneous use of the Orange Lockseed and Peach Energy Lockseed.

The enhanced skill of this Jimber Arms is auditory, allowing Gaim to hear from a great distance. Because of this, it can be used to sense an enemy's location. However, it is unable to handle higher-pitched sound waves. Due to its particular enhancements, Jimber Peach Arms is most frequently used outside of battle, instead being typically used in locating rather than engagement.

・Jimber Melon Arms

"Soiya! Mix! Orange Arms: Hanamichi [To The Blossomed Path] On Stage! Jimber Melon! Ha-Ha!"
ーTransformation announcementー

"Soiya! Mix: Jimber Melon! Ha-Ha!"
ーShortened transformation announcementー

Jimber Melon Arms

Jimber Melon Arms (Concept Art)

Rider Statistics:

　・Height: 206 cm
　・Weight: 110 kg.

Ability Parameters:

　・Punching Power: 13.7 t.
　・Kicking Power: 17.9 t.
　・Maximum Jump Height: 25 m.
　・Maximum Running Speed: 100 m per 5.6 sec.

Jimber Melon Arms (ジンバーメロンアームズ Jinbā Meron Āmuzu) is Gaim's orange/cantaloupe-based fusion form, which is accessed through the simultaneous use of the Orange Lockseed and Melon Energy Lockseed.

However, unlike the other Jimber Arms, this form shows the exterior of the fruit rather than the slices of the Energy Lockseed used.

・Jimber Matsubokkuri Arms

"Soiya! Mix! Orange Arms: Hanamichi [To The Blossomed Path] On Stage! Jimber Matsubokkuri! Ha-Ha!"
ーTransformation announcementー

"Soiya! Mix: Jimber Matsubokkuri! Ha-Ha!"
ーShortened transformation announcementー

Rider Statistics:

　・Height: 206 cm
　・Weight: 110 kg.

Ability Parameters:

　・Punching Power: 13.7 t.
　・Kicking Power: 17.9 t.
　・Maximum Jump Height: 25 m.
　・Maximum Running Speed: 100 m per 5.6 sec.

Jimber Matsubokkuri Arms (ジンバーマツボックリアームズ Jinbā Matsubokkuri Āmuzu) is Gaim's orange/cone-based fusion form, which is accessed through the simultaneous use of the Orange Lockseed and Matsubokkuri Energy Lockseed.

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Super Arms
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・Kachidoki Arms

"Soiya! Kachidoki Arms: Iza Shutsujin! [Now, Into The Battle!] Ei, Ei, Oh!"
ーTransformation announcementー

Rider Statistics:

　・Rider Height: 215 cm.
　・Rider Weight: 128 kg.

Ability Parameters:

　・Punching Power: 16 t.
　・Kicking Power: 21.4 t.
　・Maximum Jump Height: 16 m.
　・Maximum Running Speed: 100 m per 7.2 sec.

Kachidoki Arms (カチドキアームズ Kachidoki Āmuzu, lit. "Triumph Arms") is Gaim's orange-based super form and the evolved form of Orange Arms. Accessed through the Kachidoki Lockseed, this form bears the Kachidoki Kabuto (カチドキカブト lit. "Triumph Helmet") helmet.

While assuming Kachidoki Arms, Gaim dons the Kachidoki Armor Part (カチドキアーマーパート Kachidoki Āmā Pāto, lit. "Triumph Armor Part") and his Arms Weapon is the DJ Gun. He also possesses twin orange sashimono marked with his emblem in black called the Kachidoki Bata (カチドキ旗(バタ) lit. "Triumph Flags"), which are normally attached to his back.

In this form, his power has been greatly increased, making him more powerful than Kamen Rider Baron Lemon Energy Arms and any other Genesis Riders. He has more strength than his Jimber Arms. However, his speed and jumping height are visibly affected due to its bulky armor. As a trade-off, this set of Arms sports impressive defensive power, which is enough for him to withstand the firepower of dozens of Dandeliners with no ill effect. The defensive power of this Arms also allows him to withstand the power of two Suika Arms units attempting to crush him.

Kamen Rider Gaim Kachidoki Arms can perform his following finishers:

　・Burai Kick (無頼キック Burai Kikku): Gaim activates the Squash function on his Sengoku Driver and leaps into the air in a somersault and flies in with pure energy coating his foot before making contact with the enemy.

　・Kachidoki Charge (カチドキチャージ Kachidoki Chāji, lit. "Triumph Charge"): Gaim locks the Kachidoki Lockseed into the DJ Gun and fires a large ball of energy from the DJ Gun at the enemy.

　・Hinawa Daidai Musou Zan (火縄大橙無双斬 Hinawa Daidai Musō Zan, lit. "Matchlock Great Orange Unrivaled Slash"): Gaim locks the Kachidoki Lockseed into the DJ Gun and ignites the DJ Gun's blade in flames before unleashing a powerful slash on the enemy.Flags Wild Dance (旗乱舞 Bata Ranbu): Gaim summons and charges the Kachidoki Bata with orange energy before he delivers several orange-based energy slashes.

・Kiwami Arms

"Lock Open! Kiwami Arms: Dai, Dai, Dai, Dai, Dai Shogun!"
ーTransformation announcementー

Rider Statistics:

　・Rider Height: 215 cm.
　・Rider Weight: 113 kg.

Ability Parameters:

　・Punching Power: 14.5 t.
　・Kicking Power: 20.4 t.
　・Maximum Jump Height: 20 m.
　・Maximum Running Speed: 100 m per 5.8 sec.

Kiwami Arms (極［キワミ］アームズ Kiwami Āmuzu lit. "Extreme Arms") is Gaim's fruit basket-based final form and the true form of Kachidoki Arms. Accessed through the simultaneous use of the Kachidoki Lockseed and Kiwami Lockseed via the Senyo Joint replacing his Sengoku Driver's Rider Indicator, this form bears the Kiwami Kabuto (キワミカブト lit. "Extreme Helmet") helmet.

Unified by all of the basic, the Apple and Energy Armor Parts, Gaim purges both his Kachidoki Arms' Armor Part and Ride Wear suit to create a silver-white armor suit that bears a long cape, which has been shown to be removable for various uses (i:e bullfighting). Both sides of Gaim's belt are replaced with Lockseed Holders carrying six of his base Lockseeds, with the original right-sided holder carrying his first three normal Lockseeds (Orange, Pine, and Ichigo), while a new holder on his left side replaces the Musou Saber Holster by carrying his three confiscated Energy Lockseeds (Lemon Energy, Cherry Energy, and Peach Energy).

In this form, Gaim has lost some of his physical might from Kachidoki Arms, but is far more flexible than Kachidoki Arms and still performs better compared to a Jimber Arms. Also, he gains more speed compared to Kachidoki Arms. To make up for the slightly weaker stats, Gaim receives the ability to summon and utilize either any of the thirteen basic Arms Weapons, any of the Apple Riders' Arms Weapons, any of the three weapons with an attachment slot for the Lockseeds or the Kagematsu Shin simply by accessing their power through the Kiwami Lockseed, thus the addition of a second Lockseed Holder for Gaim's Energy Lockseeds.

In order to access his summoning ability, Gaim must turn the Kiwami Lockseed once, which causes the Sengoku Driver to announce the name of said weapon. As an added bonus, he is capable of doing this multiple times to summon different weapons, simultaneously if necessary, which can also allow him to fire off the summoned weapons as projectiles against the enemy. Gaim has also been shown to maintain summoned weapons from a different Arms if he transforms directly into Kiwami Arms. In addition, he is also able to bring forth a different weapon in place of his current weapon without turning the Kiwami Lockseed.

The attack power of any weapon summoned by this ability, as well as the force of its finishing attack, is far more superior than when it is normally wielded by an ordinary Sengoku Rider or Genesis Rider, allowing Gaim to inflict damage upon an Enhanced Overlord Inves when any of them are unable to.

However, the repeated usage of Kiwami Lockseed would cause Yuuki slowly lost his humanity by slowly transforming him into an Overlord, eventually granting him additional powers, such as manipulation of Helheim's vines and the ability to regenerate damaged Lockseeds. After Yuuki devours the Forbidden Fruit and becomes the Man of the Beginning, he can directly transform into Kiwami Arms with a simple call of "Henshin".

The Kiwami Lockseed is also directly tied with Yuuki's Overlord form. Should Yuuki dies, the simple activation of the Lockseed by someone else will revive him.

Kamen Rider Gaim Kiwami Arms can perform his following finishers:

　・Burai Kick (無頼キック Burai Kikku): Gaim activates the Squash function on his Sengoku Driver and leaps into the air in a somersault and flies in with pure energy coating his foot before making contact with the enemy.

　・Spear Victory (スピアビクトリー Supia Bikutorī): Gaim activates the Squash function on his Sengoku Driver and executes one of two variations of this attack.
　　・Like Baron's Banana Squash, Gaim releases a spear-shaped beam of energy from the Banaspear to thrust at the enemy.
　　・Gaim stabs the Banaspear into the ground, causing multiple banana-shaped projections to encase the enemy.

　・Hinawa Daidai Musou Zan (火縄大橙無双斬 Hinawa Daidai Musō Zan, lit. "Matchlock Great Orange Unrivaled Slash"): Gaim activates the Au Lait function on his Sengoku Driver and charges the DJ Gun in Taiken Mode with energy surrounded by image projections of fruits before slashing down the target. The fruit image projections scatter on impact.

　・Kunai Burst (クナイバースト Kunai Bāsuto): Gaim locks the Ichigo Lockseed into the Musou Saber and unleashes a giant energy-shaped strawberry that explodes into countless amounts of kunai that rain down on the enemy.

　・Fruits Basket Charge (フルーツバスケットチャージ Furūtsu Basuketto Chāji): Gaim locks a normal Lockseed into the DJ Gun and fires a powerful blast surrounded by a projection of multiple fruits at the enemy, which envelopes and soon destroys the target.
　　・Orange Charge (オレンジチャージ Orenji Chāji)
　　・Pine Charge (パインチャージ Pain Chāji, short for "Pineapple Charge")
　　・Ichigo Charge (オレンジチャージ Orenji Chāji)