Publication Information
- Riders : Kamen Rider Den-O
- Japanese : 仮面ライダー電王
- Type : Den-O's Form
- HomeWorld : Earth (Main Timeline Continuity)
- Season : Kamen Rider Den-O
- First Appeareance : Kamen Rider Den-O Episod 1 : Here I Come!
- Main View : Full Episod
Den-O Liner Form

- Den-O Liner Form
- Liner Form! ― Transformation announcement
- Rider height : 195 cm.
- Rider weight : 94 kg.
- Punching power : 6 t.
- Kicking power : 7 t.
- Maximum jump height : 45 m.
- Maximum running speed : 100 m. per 3.5 sec.
- Ending theme : Real-Action
- Liner Form is Den-O's super form, gained when the Tarōs created the DenKamen Sword for Ryotaro to use when their synchronization with him was starting to fail whenever in the past. In order to initially transform into Liner Form, the Rider Pass must be put in a slot in the back of the blade of the DenKamen Sword, while also putting the K-Taros onto the Terminal Buckle.
This form, solely controlled by Ryotaro with the Imagin using the DenKamen Sword as a means of communication, is themed around Den-Liner in transformation and attack. Ryotaro also utilizes each Imagin's respective fighting style when their mask is selected on the DenKamen Sword (eg. Kintaros' strength and defense in KinAx mode, and Ryutaros' breakdancing techniques in RyuGun mode). It soon becomes the only form Ryotaro is able to use while fighting in the past after all of his other forms become inaccessible.
Although considerably versatile, Liner Form does not hold any significant strengths over Den-O's other forms besides being the fastest, which sometimes leaves Ryotaro at a disadvantage. This form was also inaccessible at first without the Taros to assist him. Later on, Ryotaro was able to use this form by himself though, as shown in the final episode of Den-O's series, which was taken as a sign of his now stronger will. Liner Form is also able to use the DenGasher, though this is only shown when the DenKamen Sword was left behind following the Taros all joining the same battlefield as Den-O.
Yuuki Plat Form

- Yuuki Plat Form
- Plat Form is Yuuki's most basic default form undersuit, which is briefly seen during Yuuki's transformation sequence before the Aura Armor and the Denkamen facemask attaches.

- Yuuki Skull Form
- Skull Form! ― Transformation announcement
- Punching power: 7.5 t.
- Kicking power: 9 t.
- Maximum jump height: 40 m.
- Maximum running speed: 100 m. per 5 sec.
- Skull Form is the form of Kamen Rider Yuuki that is accessed when Ryotaro Nogami was unwillingly possessed by the Ghost Imagin. In this form, Yuuki is armed with the Ghost Imagin's sword. In Skull Form, Yuuki's Full Charge is the Terminate Flash. As the name and design implies, Skull Form's motif is the skeleton.
Mini Den-O's Forms
Mini Den-O's Plat Forms

- Mini Den-O's Plat Forms
- Plat Form is Mini Den-O's most basic default form undersuit, which is briefly seen during Mini Den-O`s transformation sequence before the Aura Armor and the Denkamen facemask attaches.

- Mini Den-O's Sword Form
- Sword Form! ― Transformation announcement
- Height : -
- Weight : -
- Punching Power: 7t
- Kicking Power: 10t
- Maximum Jump Height: 40 m
- Maximum Running Speed: 100m/3.8s

New Den-O's Forms
New Den-O's Plat Forms

- Mini Den-O's Plat Form
- Plat Form is New Den-O's most basic default form undersuit, which is briefly seen during New Den-O`s transformation sequence before the Aura Armor and the Denkamen facemask attaches.

- Mini Den-O's Strike Form
- Strike Form! ― Transformation announcement
- Rider height : 194 cm.
- Rider weight : 92 kg.
- Punching power : 6 t.
- Kicking power : 7 t.
- Maximum jump height : 38 m.
- Maximum running speed : 100 m. per 4 sec.
- Strike Form is the default form of New Den-O, able to wield the Macheteddy to perform his Counter Slash. Strike Form is also able to use the Taros in the form of the Kintaono, the Uratazao, and the Momotaken.

Mini Den-O's Vega Form

- Mini Den-O's Vega Form
- Vega Form is the form of New Den-O that first appears in The Onigashima Battleship. Kotaro allows Deneb to possess him and use his abilities, his Denkamen made up of a spool of thread much like Zeronos' Vega Form. In this state, New Den-O can use his DenGasher in Naginata Mode. This form is assumed automatically following Deneb's possession of Kotaro.
Final Form Ride
Den-O Final Form Ride

- Den-O Final Form Ride
- Final Form Ride: D-D-Den-O! ― Transformation announcement
- Imagin User : Momotaros
- Den-O Form : When the recently de-aged Ryotaro leaves to investigate the Oni disturbance in the past, Momotaros loses his physical form and possesses Yusuke Onodera, allowing him the ability to transform into Den-O sword form. He counters the threat of the Imagin with Tsukasa Kadoya, Kamen Rider Decade, and eventually becomes his ally, as he acquires the Den-O Kamen Ride, Final Form Ride and Final Attack Ride Cards. It will eject the host, if there is any, during the transformation.
- Decade Forms : Like in the original series, one who become Den-O has access to four basic forms based on the Imagin in control of the possessed human: Momotaros allows for Sword Form, Urataros allows for Rod Form, Kintaros allows for Ax Form, and Ryutaros allows for Gun Form. The Swan Imagin Sieg, who allows for Den-O to become Wing Form, can join the Tarōs in achieving the stronger Super Climax Form. Den-O's Final Form Ride Card, Momotaros provides Momotaros with a physical body, ejecting his host. Unlike previous Final Form Ride cards, this one stays in effect even after Decade has reverted to Tsukasa. The card was initially in the possession of Diend as Denliner, supposedly allowing Den-O to transform into a form similar to DenLiner Gouka, but it changed to Den-O Momotaros upon Decade snatching the card from Diend.
Rider Cards
Kamenride : Den-O

- Main Article : Kamenride : Den-O
All Equipment Weapons Vehicles See more:
- Main Article : Den-O Arsenal, Weapon & Abilities