Kamen Rider Den-O Plat Form

Plat Form,Den-O's most basic form, is a black and white form that is activated when first initiating a transformation using a Rider Pass. If the corresponding color-coded button is selected, then by swiping the Pass once more, a form change will occur. Ryotaro rarely uses this form, as it does not have sufficient armor and pales in comparison to the abilities of the other forms. Only when he does not want the assistance of the Tarōs or is transitioning into Liner Form, does he use this form. Plat Form is designed and named after a railway platform.

Kamen Rider Den-O Sword Form

Sword Form is Kamen Rider Den-O's first form, used while Ryotaro is possessed by Momotaros. When in Sword Form, he uses the DenGasher as a standard sword-style weapon. Sword Form is the most balanced of all his forms. However, Sword Form is unable to operate underwater. This is the more commonly used Den-O form, possibly because of Momotaros' prominence among the other Imagin. Momotaros himself assumed Sword Form during the events of "Final Countdown" to battle Kamen Rider Yuki. Every so often, Momotaros will develop a new Deathblow Attack that he uses to finish off Imagin, and has developed Parts 1, 2, 2' (2-dash), 3, 5, Special Version (used in "I'm Born!"), and the other-Imagin-assisted Final Version, although the attacks hardly differ from one another (Final Version uses the energy of the other Taros, Sieg and Zeronos, making it the only exception). The eyes on the Sword Form's Denkamen resemble two halves of a peach, the fruit associated with the story of Momotaros, the Peach Boy, upon which Sword Form is based.

Kamen Rider Den-O Rod Form

Rod Form is Kamen Rider Den-O's second form, used while Ryotaro is possessed by Urataros. When in Rod Form, the DenGasher is able to transform into a rod-style weapon. Rod Form gains the ability to perform underwater, extra protection, and increased kicking power but suffers a loss of speed and jumping height. Urataros himself assumes this form when he borrowed Ryotaro's Belt to fight off the Mole Imagin he tricked, and again during "Final Countdown" to fight the army of revived Imagin. This form is one of the least used of Den-O's forms, as Urataros rarely fights. However, when the fight occurs in the proximity of water or if the other Imagin are unable to fight, Urataros will assist with his fishing skills.The Aura Armor and Denkamen resembles a sea turtle, the animal associated with the legend of Urashima Taro, upon which Rod Form is based.

Kamen Rider Den-O Axe Form

Axe Form is Kamen Rider Den-O's third form, used while Ryotaro is possessed by Kintaros. When in Ax Form, the DenGasher is able to transform into an axe for short ranged attacks. Ax Form gains increased punching power and defense but suffers a loss of speed and kicking power. This form is the physically strongest of the Den-O forms, due to Kintaros's own brute strength. Kintaros himself assumes this form using the Den-O Belt to help Ryotaro fend off an army of Imagin in the past, and again during "Final Countdown" to fight off the army of revived Imagin. Kintaros tends to fight as Ax Form whenever he senses crying or he hears someone near Ryotaro say anything resembling the Japanese word for "cry". Ax Form's Aura Armor is golden yellow and the motif is that of an ax, the Golden Boy, upon which Ax Form is based. The Denkamen is also shaped like the Kanji for the word "gold".

Kamen Rider Den-O Gun Form

Gun Form is Kamen Rider Den-O's fourth form, used while Ryotaro is possessed by Ryutaros. When in Gun Form, the DenGasher is able to transform into a gun for short range and long range attacks. Gun Form displays an increase in speed, power, and defense, easily making it the most superior of the four basic forms. Ryutaros tends to fight as Gun Form at his whim, as he is able to overpower the other three Tarōs as well as Ryotaro himself. However, he also tends to cause more collateral damage than the other forms because of his low precision and the high power of his ammunition. Ryutaros himself assumed Gun Form during the events of "Final Countdown" in order to battle the revived army of Imagin. Ryutaros incorporates break-dancing moves into his fighting style in Gun Form, making his movements somewhat unpredictable. The motif of Gun Form is that of a dragon, the creature associated with the story of Tatsu no Ko Tarō, Tarō the Dragon Boy, upon which Gun Form is based.

Kamen Rider Den-O Wing Form

Wing Form is Den-O's fifth form, used while Ryotaro is possessed by Sieg, first used by W-Ryotaro to protect Shiori Takayama from the Scorpion Imagin, though it is unable to finish the fight due to Sieg's dwindling strength. Wing Form is used again during the trip to the Edo period to fight the Cobra Imagin. Sieg himself assumes Wing Form during the events of "Final Countdown" to assist in fighting Shiro's army of revived Imagin. Den-O Wing Form uses the DenGasher as two separate weapons, a boomerang and a handaxe when in Wing Form. Though resembling Sword Form, the Aura Skin becomes gold, different shoulders are used, and the Denkamen's visor is, blue swan-like wings,upon which Wing Form is based (the transformation itself appears as if a swan had landed in front of Den-O's face). In order to access Wing Form, the golden Wing Buckle must be placed over the Terminal Buckle.This form gives Den-O an increase in mobility even greater than what Gun Form could provide.

Kamen Rider Den-O Climax Form

Climax Form is Den-O's sixth and strongest form, gained when all Tarōs but Momotaros faded away and the Ryotaro's desire not to lose them created the K-Taros cell that attached to Den-O Belt once the code 3-6-9-# is entered. Climax Form is basically a stronger version of Sword Form that incorporates the Denkamen of the other three primary Den-O forms onto various parts of the armor. Due to the nature of Climax Form, the Tarōs need to work as a unit to fight, and their strengths are incorporated into Climax Form. Rod Form's mask is on the right shoulder with Urataros controlling the right arm, Ax Form's mask on the left shoulder with Kintaros controlling the left arm, and Gun Form's mask on the chest with Ryutaros control the legs. These three masks can travel along tracks on Climax Form's body to align on the leg or arm to enter Kick Mode or Punch Mode, with the three Tarōs controlling that one limb while leaving Momotaros to control the rest of the body to perform "Charge and Up" attacks.