As with the other Sengoku and Genesis Riders, Kamen Rider Baron's forms are called Arms (アームズ Āmuzu). His personal Lockseeds are styled in pure English that is sung in a chorus-like manner with a "[Noun 1] of [Noun 2]" theme, With the exception of Lemon Energy Arms, all of Baron's European Knight-themed Arms' share the title Casque (カスク Kasuku), while his visors share the title Sight (サイト Saito).

As a Sengoku Rider, Baron's Sengoku Driver plays European trumpet music and announces "Come On" (カモン Kamon) before every transformation. By pressing the Sengoku Driver's Cutting Blade down on the Lockseed after transforming from one to three times, he 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)

As a Genesis Rider, Baron's Genesis Driver announces "Soda" (ソーダ Sōda) before every transformation. By pushing the Genesis Driver's Seaboll Compressor into the Energy Lockseed after transforming from one to two times, he can activate one of two finishing moves based on his current Arms form:

　・Squash (スカッシュ Sukasshu)
　・Sparking (スパーキング Supākingu)

In addition to the Genesis Driver's finishing moves, Baron can perform a Sonic Volley (ソニックボレー Sonikku Borē) finishing attack by inserting an Energy Lockseed into the Energy Drive Bay of his Sonic Arrow.

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(Genetic) Ride Wear
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The Ride Wear (ライドウェア Raido Uēa) is Baron's default form undersuit, which is briefly seen during Baron's transformation sequence before the Armor Part 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 Baron'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 or Senyo Joint.

This suit also doubles as Baron's Genetic Ride Wear (ゲネティックライドウェア Genetikku Raido Uēa) if he uses the Genesis Driver to access Lemon Energy Arms. Therefore, during battle, the suit will stay on if Haruka decides to change drivers.

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Sengoku Driver
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・Banana Arms

"Come On! Banana Arms: Knight of Spe~ar! "
－Transformation announcement－

Rider Statistics

・Height: 208 cm.
・Weight: 114 kg. (251 lbs.)

Ability Perimeters

・Punching Power: 8.8 t.
・Kicking Power: 12.4 t.
・Maximum Jump Height: 24 m.
・Maximum Running Speed: 100 m. per 6.1 sec.

Banana Arms (バナナアームズ Banana Āmuzu) is Baron's banana-based default form. Accessed through the Banana Lockseed, this form bears the Burn Casque (バーンカスク Bān Kasuku, a pun on "Banana") helmet with the Burn Sight (バーンサイト Bān Saito, see "Burn Casque") visor.

While assuming Banana Arms, Baron dons the Banana Armor Part (バナナアーマーパート Banana Āmā Pāto) and his primary Arms Weapon is the Banaspear.

This form is Baron's most balanced form. In this form, Baron's punching and kicking power is more stronger than Gaim's. However as a tradeoff, Baron's maximum height and running speed is lower than Gaim's, making him able to jump a little higher than Gaim in Pine Arms, but also barely be able to outrun Gaim in Pine Arms. While Banana Arms appears to be purely offensive with little to no defense, Baron can use the Banaspear to create Banana projections that can absorb hits.

Kamen Rider Baron Banana Arms can perform his following finishers:

　・Cavaliend (キャバリエンド Kyabariendo): Baron activates the Squash function on his Sengoku Driver and gives a very powerful kick in the shape of a banana.

　・Spear Victory (スピアビクトリー Supia Bikutorī): This finisher has three variations depending on which function Baron activates from his Sengoku Driver.

　　・Squash: Baron releases a spear-shaped beam of energy from the Banaspear to thrust at the enemy.
　　・Au Lait: Baron smashes down his enemy with a giant banana-shaped energy projection from the Banaspear. When stabbed into the ground, however, the energy travels along the ground for a bit before rocketing back up in the familiar banana-shaped projecting, skewering whatever is in its path.
　　・Sparking: Baron stabs the Banaspear into the ground, creating multiple banana-shaped projections which hit an opponent several times from below. This also provides as a defensive wall against incoming attacks.

・Mango Arms

"Come On! Mango Arms: Fight of Ham~mer! "
－Transformation announcement－

Rider Statistics

・Height: 208 cm.
・Weight: 111 kg. (245 lbs.)

Ability Perimeters

・Punching Power: 10 t.
・Kicking Power: 12.4 t.
・Maximum Jump Height: 22 m.
・Maximum Running Speed: 100 m. per 6.5 sec.

Mango Arms (マンゴーアームズ Mangō Āmuzu) is Baron's mango-based form. Accessed through the Mango Lockseed, this form bears the Go Casque (ゴーカスク Gō Kasuku) helmet with the Go Sight (ゴーサイト Gō Saito) visor.

While assuming Mango Arms, Baron dons the Mango Armor Part (マンゴーアーマーパート Mangō Āmā Pāto) and his primary Arms Weapon is the Mango Punisher.

In this form, Baron gains a boost in punching power, nearly punching as hard as Zangetsu, but his kicking power retains the same strength. As a trade-off, Mango Arms can jump just as high as Gaim in Pine Arms, and is just as fast.

Kamen Rider Baron Mango Arms can perform his following finishers:

　・Punish Mash (パニッシュマッシュ Panisshu Masshu): This finisher has three variations depending on which function Baron activates from his Sengoku Driver.

　　・Squash (Variant #1): Baron swings the Mango Punisher, sending a projection of the Mango Punisher's head at the target.
　　・Squash (Variant #2): Baron charges the Mango Punisher, hitting his enemy with a giant projection of the Mango Punisher's head.
　　・Au Lait: Baron swings the Mango Punisher around multiple times, growing in intensity, until he stops, making a giant projection of the Mango Punisher's head fire from the mace and slams into the target from an aerial angle.
　　・Sparking: Baron performs a powerful swing, sending a giant, more solid-looking projection of the Mango Punisher's head straight at the target.

・Ringo Arms

"Come On! Ringo Arms: Desire Forbbiden Fruits! "
－Transformation announcement－

Rider Statistics

・Height: 208 cm.
・Weight:113 kg.

Ability Perimeters

・Punching Power: 17.4 t.
・Kicking Power: 19.7 t.
・Maximum Jump Height: 23 m.
・Maximum Running Speed: 100 m. per 5.7 sec.

Ringo Arms (リンゴアームズ Ringo Āmuzu, lit. "Apple Arms") is Baron's apple-based final form that is accessed through the Forbidden Ringo Lockseed.

While assuming Ringo Arms, Baron dons the Ringo Armor Part (リンゴアーマーパート Ringo Āmā Pāto, lit. "Apple Armor Part") and his Arms Weapons are the Sword Bringer and Apple Reflecter.

Kamen Rider Baron Ringo Arms can perform his following finishers:

　・Unnamed Rider Slash: Baron activates the Squash function on his Sengoku Driver and unleashes a powerful slash with the Sword Bringer.

　・Cavaliend (キャバリエンド Kyabariendo): Baron activates the Sparking function on his Sengoku Driver and jumps into the air, engulfed by a red apple-like energy focused on his left foot as he strikes the target with a powerful kick.

Ringo Arms is normally used by Kamen Rider Idunn.

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Genesis Driver
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・Lemon Energy Arms

"Soda! Lemon Energy Arms: Fight, Power! Fight, Power! Fight! Fight! Fight! Fight! Fi-Fi-Fi-Fi-Fight! "
－Transformation announcement－

Rider Statistics

・Height: 208 cm.
・Weight: 111 kg. (245 lbs.)

Ability Perimeters

・Punching Power: 15.1 t.
・Kicking Power: 18.3 t.
・Maximum Jump Height: 25 m.
・Maximum Running Speed: 100 m. per 5.9 sec.

Lemon Energy Arms (レモンエナジーアームズ Remon Enajī Āmuzu) is Baron's lemon-based super form. Accessed through the Lemon Energy Lockseed, this form bears the Lemos Headpiece (レーモスヘッドピース Rēmosu Heddopīsu) helmet with the Steering Eye (ステアリングアイ Sutearingu Ai) visor.

While assuming Lemon Energy Arms, Baron dons the Lemon Energy Armor Part (レモンエナジーアーマーパート Remon Enajī Āmā Pāto) and his primary Arms Weapon is the Sonic Arrow.

This form is a vast improvement for Baron, increasing his offensive power beyond what Mango Arms can offer, with his agility stats being a tad bit better than Banana Arms, jumping as high as Gaim in a Jimber Arms, and running as fast as Gaim in Orange Arms, Ryugen in Budou Arms, Bravo, and Knuckle.

Kamen Rider Baron Lemon Energy Arms can perform his following finishers:

　・Cavaliend (キャバリエンド Kyabariendo): Baron activates the Sparking function on his Genesis Driver and fuels all the energy from the Lemon Energy Lockseed to its maximum potential before he jumps through a line of lemon slices and hits the target with his kick.

　・Unnamed Rider Slash: Baron activates the Squash function on his Genesis Driver and fuels all the energy from the Lemon Energy Lockseed into his body, which is then converted into his Sonic Arrow before he slashes the target. This finisher has two variations; a 360 degree circle slash for multiple targets and a straight slash for a single target.

　・Sonic Volley (ソニックボレー Sonikku Borē): Baron locks the Lemon Energy Lockseed into the Sonic Arrow and fires a powerful arrow shot that pierces through the target.

　・Banana Charge (バナナチャージ Banana Chāji): Baron locks the Banana Lockseed into the Sonic Arrow and stabs the Sonic Arrow into the ground, which then shoots a holographic banana at the target that explodes and traps it in more banana projections.