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Icon-den-o.pngThis article is about a monster/rider in Kamen Rider Den-O.

"Advent, to the top..."
―Sieg's pre-battle catchphrase[src]

Sieg (ジーク, Jīku) is an Imagin who is unofficially the fifth part of the DenLiner crew, providing Ryotaro Nogami with Den-O's Wing Form.


Kamen Rider Den-O

S-Ryotaro in the DenLiner.

Sieg arrived 6 months prior to Ryotaro becoming Den-O, originally intending to forge a contract with a young wealthy woman named Shiori Takayama. But she was pregnant and Sieg ended up inside the baby in a deep sleep until he emerges in physical form with no memory of the wish and believes that he forged a contract with the baby, Yusuke, instead of Shiori as he had planned. Sieg took his "brother" out of the strange area he found them in, only to meet Ryutaros who takes Sieg to the DenLiner, where the Imagin got his own sleeping car with a lavish bed and Ryutaros helped fill it with stray puppies and kittens. After a series of events that clear Ryotaro of Yusuke's abduction, Sieg uses the human's body to reap the benefits of living with the Takayama family

However, because Yusuke's mind is too young to maintain his existence, Sieg begins to fade away, but not before becoming Den-O Wing Form to fight the Scorpion Imagin. After the Scorpion Imagin is defeated, Ryotaro returns with a Rider Ticket that he got from Shiori that bore the date June 1, 1997, revealing that Sieg did have a contract with her. He then remembers Shiori's wish for her baby to be born safely, fulfilling that contract. With the DenLiner gang's help, Sieg arrives in the past to live peacefully. Enter the Prince, Kneel Down to Him! The Prince's Goodbye Lullaby

Kamen Rider Den-O: I'm Born!

However, during the hijack of the DenLiner, Sieg offers his aid to Ryotaro in the Tarōs' stead as only he could possess Ryotaro's body, deciding to repay his debt to Ryotaro for preventing his disappearance. Kamen Rider Den-O the Movie: I'm Born!

He battled the Cobra Imagin in the Edo period while befriending Kotaro. He would aid the DenLiner gang two more times, aiding in Ryotaro getting stronger and later assisting Ryotaro and the others in defeating Kai's army of Imagin after being retrieved by Naomi. But due to his birth and time with Ryotaro creating a time lag, Sieg is able to maintain his existence as he takes his leave in the DenLiner.

The Climax Goes On, No Matter What

In final episode, Naomi returns Sieg to the present for the latter for the final battle, where he protected Kohana, and helped Taros and Deneb defeat the Death Imagin.

Post Series and other events

Saraba Kamen Rider Den-O: Final Countdown


During the events of "Final Countdown", Sieg greets the DenLiner crew in May 23, 1729 as their contract, offering his help as Wing Form during the epic battle against the revived Imagin. Following a pattern of showing up when help is needed, he appears later to help in the battle of the returning Oni forces.

Kamen Rider Decade

Here Comes Super Momotaros!

Sieg as seen in Decade.

Sieg appears in Kamen Rider Decade when Tsukasa and company were about to enter the World of Kabuto when they get an unexpected visit from the Imagin Sieg. With a manuscript on Sieg's person, it appears that the adventures in the World of Den-O are far from over.

Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship

Taking place after the events of Kamen Rider Decade episode 15, under the impression that they saved the World of Den-O, Tsukasa Kadoya and company begin their journey to the World of Kabuto when they are halted by Sieg who presents them a manuscript that detailed the legendary Oni Conquest with Momotaros' image on it. As this occurred, the Tarōs mysteriously vanish from the DenLiner as they are about to help Kotaro Nogami out with the true threat to their world.

Traveling to that time, the kids find Tsukasa who offers his aid. Kotaro is reluctant to accept his help until Tsukasa reveals the scroll Sieg brought with him that has Momotaros on it.

Later Kuchihiko reassembles the Oni's Trump Stone with Mimihiko activating the Demon's Warship in the present and using it to return to the past. The Oni Brothers are able to defeat them until Tsukasa and Sieg arrive, allowing Den-O to assume Wing form as Momotaros possess Tsukasa.

At Decade's suggestion, Ryotaro forms Kamen Rider Den-O Super Climax Form with the Tarōs and Sieg. Cho-Den-O and Decade manage to overwhelm the Oni Brothers with New Den-O Vega Form and Teddy's aid. After Shilubara sacrifices himself to protect his brother, an enraged Goludora enters the Warship and engages the DenLiner in a battle with Decade taking his leave as the DenLiner gang manages to sink the Warship from the inside out as Kamen Rider Den-O Sword finishes Goludora off with a Rider Kick.

Kamen Rider × Kamen Rider W & Decade Movie War 2010

Final Form Riders

Kamen Rider Den-O Super Climax Form appears when the Nine Worlds' Kamen Riders arrive to support them, but the fight is still to Doras's advantage until Decade assumes Complete Form while having most of the Nine Riders assume their ultimate forms (Kuuga Rising Ultimate, Agito Shining Form, Ryuki Survive, Faiz Blaster Form, Blade King Form, Armed Hibiki, Kabuto Hyper Form, Den-O Super Climax Form, and Kiva Emperor Form), and together destroy Doras with an all-out attack. However, wanting to play more, the Neonoid sends out a mammoth robot to attack the Riders

Episode Blue: The Dispatched Imagin is Newtral

Sieg appears in the moment, when Momotaros and Ryotaro unable to continue, the Owner reassures the DenLiner crew that they still have hope as Sieg arrives, later With the others shocked, the Owner reveals Kotaro's friendship with Teddy saved him and restored their contract. Though the others were confused by the whole point of the Owner's actions, along with Sieg’s appearance, Kotaro believes it was to teach him a valuable lesson as he and Teddy are returned to their time.

Video Game appearances

Kamen Rider: Battride War II

Kamen rider-266888.jpg

Kamen Rider Den-O Wing Form reappeared in Kamen Rider: Battride War II.

Kamen Rider Battle: Ganbaride

Kamen Rider Den-O Wing Form and Super Climax Form appears as a playable character in this video game.

Kamen Rider Battle: Ganbarizing

Kamen Rider Den-O Super Climax Form card

Although Kamen Rider Den-O Wing Form has not yet had his debut in this video game, Sieg still appeared in Super Climax Form and has his lines.

Super Hero Generations


Sieg as Kamen Rider Den-O Wing Form is a playable character with others Kamen Riders of Neo-Heisei era in the Video game.

Kamen Rider Buttobasoul

Sieg Medal

Sieg as Kamen Rider Den-O Wing Form is a playable character in Kamen Rider Buttobasoul.

Kamen Rider Den-O Wing Form Medal

Other Game appearances

Battle Spirits

Sieg as Kamen Rider Den-O Wing form appears with other Kamen Riders and Monsters in Battle Spirits.


""Kneel down to me!""

While in a contract with Shiori, Sieg gained a physical form based on the ballet Swan Lake (白鳥の湖, Hakuchō no Mizūmi), with "Swan" written on his breast plate, named after its character Prince Siegfried (ジークフリート王子, Jīkufurīto Ōji). Because of his princely mannerisms, Sieg becomes easily infuriated when treated with disrespect. During his first time on the DenLiner, he demanded that the others call him "Prince" (プリンス, Purinsu) until he got hit by Hana, calling her "Princess" (, Hime) since as he called the Taros his "friends". After his return, Sieg refers to the Tarōs as either his "family" instead of his "friend" phrasing, or his "retainers".


  • Reduction of size:Because he was "born" in 2007, Sieg possesses the unique ability of shrinking other Imagin to four inches in height for a bit of time with the phrase "Kneel down to me!" (頭が高い!, Zu ga takai!). In the Imagin Anime OVA, Sieg had an additional power "Super-Ultra Kneel down to me!" (スーパーウルトラ頭が高い!, Supā-Urutora Zu ga takai!) that allows him to shrink everything in sight, even an entire planet.
  • Possession:Whenever Sieg posses someone, the person gains white gold colored irises, white pupils, and white hair streaks. Said person will also obtain a white feathery scarf.






  • Height: 184 cm.[1]
  • Weight: 98 kg.[1]

Ability Parameters:

  • Punching Power: 4 t.[1]
  • Kicking Power: 8 t.[1]
  • Maximum Jump Height: 50 m.[1]
  • Motif basis: Swan, Angel
  • Fable Basis: Swan Lake
  • Contract holder/hosts: Shiori Takayama (鷹山 栞, Takayama Shiori)
  • Rider Ticket date: June 1,1997

Plat Form

Plat Form

Plat Form (プラットフォーム, Puratto Fōmu) is Den-O's most basic default form undersuit, which is briefly seen during Den-O`s transformation sequence before the Aura Armor and the Denkamen facemask attaches.

When posessed by Sieg, Plat Form appears with a golden suit rather than its traditional black suit, although the armored vest retains its black coloration.

Wing Form

Wing Form

"Wing Form!"
―Transformation announcement[src]

Rider Statistics

  • Rider Height: 193 cm.[2]
  • Rider Weight: 90 kg.[2]

Rider Senses:

  • Eyesight: 5 km.[2]
  • Enemy Sensor: 2 km.[2]

Ability Parameters:

  • Punching Power: 4 t.[2]
  • Kicking Power: 8 t.[2]
  • Resistance: 10 t.[2]
  • Maximum Jump Height: 50 m.[2]
  • Maximum Running Speed: 100 m. per 3.8 sec.[2]

When possessing Ryotaro or anyone else or by himself Sieg assumes Wing Form by placing the Wing Buckle over the Terminal Buckle. Unlike other forms Wing Form has the DenGasher become two weapons, a boomerang and a handaxe. It resembles Sword Form but the Aura Skin becomes gold, different shoulder blades are used and the visor blue resembling swan wings, the bird of the ballet, Swan Lake, which Sieg is based after. This form gives Den-O more mobility than Gun Form could provide.

Appearances: Den-O Episode 24, 27, I'm Born, Neo Generations: The Onigashima Warship

Super Climax Form

Super Climax Form

Rider Statistics

  • Rider Height: 190 cm.[3]
  • Rider Weight: 125 kg.[3]

Rider Senses:

  • Enemy Sensor: 2 km.[4]

Ability Parameters:

  • Punching Power: 8 t.[4][3]
  • Kicking Power: 10 t.[4][3]
  • Maximum Jump Height: 50 m.[4][3]
  • Maximum Running Speed: 100 m. per 3.8 sec.[4][3]

Special Attacks:

  • Super Boisterous Kick: 50 t.[4]

Super Climax Form (超・クライマックスフォー, Chō Kuraimakkusu Fōmu), originally advertised as Kamen Rider Cho Den-O (仮面ライダー超・電王, Kamen Raidā Chō Den'ō), is Den-O's eighth and true final form, exclusive to the Cho-Den-O Series and first appearing in Cho Kamen Rider Den-O & Decade NEO Generations: The Onigashima Battleship. It is identical to the original Climax Form in being a stronger version of Sword Form that incorporates the DenKamen of the other three primary Den-O forms onto various parts of the armor. However, Cho Climax Form also includes Wing Form as wings on the back of Den-O and a Wing Form insignia on the mask. It is also physically stronger than Climax Form and has the ability to use the wings to fly up and execute a stronger version of Climax Form's Rider Kick.

It should be known that Sieg's participation in this form is likely due to him possessing the de-aged Ryotaro when Momotaros invoked the Climax Form, thus making his part "unnatural". However, he participated in this form again in Kamen Rider × Kamen Rider W & Decade: Movie War 2010 when Kamen Rider Decade assumed Strongest Complete Form, which influenced the other Riders in their final forms, as well as Den-O, turning into Super Climax.

Appearances: Neo Generations: The Onigashima Battleship, Movie War 2010



  • Den-O Belt - Transformation belt
  • Rider Pass - Train pass used to invoke his transformation
  • K-Taros - A cellphone used to invoke the Climax Forms


  • DenGasher - Den-O's primary weapon, due to how it appeared when used by respective Imagin, Wing Form's took the form of Hand Ax Mode (ハンドアックスモード, Handoakkusu Mōdo) and Boomerang Mode (ブーメランモード, Būmeran Mōdo).

Legend Rider Devices

FormRide: Den-O Wing Form

  • Den-O Wing: Transforms Decade into Den-O's Wing Form. This card does not appear in the television series, but is featured in Hobby Japan's Detail of Heroes book on Decade.

Sieg Memory

Den-O Wing Form Medal

Den-O Wing Form Medal (電王ウィングフォームメダル, Uingu Fōmu Medaru): Based on Kamen Rider Den-O Wing Form.

Behind the scenes


Sieg is voiced by Shin-ichiro Miki (三木 眞一郎, Miki Shin'ichirō) who will later voice as Listol in HUGtto! Pretty Cure. In both his Imagin form and as Kamen Rider Den-O (Wing Form), his suit actor is Naoki Nagase (永瀬 尚希, Nagase Naoki).

While possessing others, he is portrayed by their respective actors while retaining his voice.


His name may be a modification of "Space-Time" (時空, Jikū).

Concept Art

Sieg concept art

Sieg was designed by Yasushi Nirasawa (韮沢 靖, Nirasawa Yasushi). In the concept art, Sieg is called Swan Imagin.


  • Sieg is based on Prince Siegfried from the Swan Lake ballet and fairy tale.
  • Unlike all of Den-O's other forms, Wing Form is simply a retooling of the standard Sword Form rather than a different configuration of the standard armor or an entirely new costume.
  • Sieg's name is given as "Zieg" in the series' photobook DETAIL OF HEROES: Masked Rider Den-O Exclusive Photograph Collection: IMAGINE, however, other materials give his name as "Sieg," such as the earlier photobook Masked Rider Den-O Photobook: IMAGIN
  • He is the only single-possession form of Den-O to require an additional piece of equipment to the Den-O belt, necessitating the Wing Buckle.
  • Sieg's role as Wing Form has mostly been limited to the Den-O movies. He only used it in the TV show once, and for little less than one minute, due to him fading away.
  • Sieg and Ryutaros are the only Imagin that never possessed Ryotaro Nogami after he was de-aged.
  • Sieg's fighting style as Den-O (slightly) resembles the traditional Chinese martial art, Tai chi, focused on calm, swift singular strikes rather than aggressive attacks and continuous movement.
  • In the ART WORKS Monsters toyline by Megahouse, Sieg is depicted having wings of his own in Imagin form. An S.I.C. figure also showcases that Den-O's Wing form is capable of flight, though neither ideas have made into the series proper.
    • An indication of what could have been was seen during Den-O Wing Form's transformation in Kamen Rider Den-O: I'm Born!, where Den-O briefly manifested a pair of wings after the armor pieces were attached onto the suit.



See also

Icon-den-o.png Kamen Rider Den-O
Kamen Riders
Ryotaro Nogami - Yuto Sakurai - Past Man - Kotaro - Kotaro Nogami - Gaoh - Negataros - Ghost Imagin - Shiro - Kuchihiko - Mimihiko - Reiji Kurosaki - Eve - Anna
Transformation Devices
Den-O Belt - Rider Pass - K-Taros - Zeronos Belt - Zeronos Cards - New Den-O Belt - Gaoh Belt - Yuuki Belt - Golden Khakkhara - Pure Silver Metal Stick - G Den-O Belt
DenGasher - DenKamen Sword - ZeroGasher - Denebick Buster - DenGasher (New Den-O) - GaohGasher - Nega DenGasher - Momotarosword - Uratarod - Kintaros Ax - Ryuvolver - Ghost Imagin's sword - Shiro's Whip - Shiro's tops - SavageGasher - Golden Khakkhara - Pure Silver Metal Stick - DenGasher (G Den-O)
Rider Machines
Machine Den-Bird - Machine ZeroHorn - Machine GaohStriker - Machine Nega DenBird - Machine New Den-Bird
Time Transports
DenLiner - ZeroLiner - KingLiner - New DenLiner - GaohLiner - Nega DenLiner - Ghost Train - Battleship of Oni
The Ally Imagin and the Support Characters
The Taros: Momotaros - Urataros - Kintaros - Ryutaros

Other: Sieg - Deneb - Teddy - Futaros

DenLiner: Owner - Naomi - Hana - Stationmaster
Milk Dipper: Airi Nogami - Seigi Ozaki - Isse Miura
The Imagin
Contract holders
Kai - Death Imagin
Bat Imagin - Chameleon Imagin - Crust Imagin - Crow Imagin - Rhino Imagin - Ivy Imagin - Owl Imagin - Whale Imagin - Wolf Imagin - Jelly Imagin - Tortoise Imagin - Scorpion Imagin - Spider Imagin - Bloodsucker Imagin - Molech Imagin - Cobra Imagin - Salamander Imagin - Gecko Imagin - Newt Imagin - Wasp Imagin - Bluebird Imagin - Rabbit Imagin - Anthopper Imagin - Kraken Imagin - Mole Imagin - Leo Imagin - Pandarabbit Imagin - Snail Imagin - Oct Imagin - Armadillo Imagin - Albinoleo Imagin - Snowman Imagin - New Mole Imagin - Pink Rabbit Imagin - Clown Imagin - Ghost Imagin - Phantom Imagin - Shadow Imagin - Piggies Imagin - Mantis Imagin

Other: Gelnewt

Icon-decade.png Kamen Rider Decade
Kamen Riders
Primary: Tsukasa Kadoya - Daiki Kaito - Natsumi Hikari
A.R. Kamen Riders: Wataru Kurenai - Yusuke Onodera - Wataru - Shinji Tatsumi - Kazuma Kendate - Takumi Ogami - Shouichi Ashikawa - Momotaros - Ryotaro Nogami - Sohji - Asumu - Kohtaro Minami (Black RX) - Kohtaro Minami (Black) - X-Rider (A.R. World) - Daisuke Yamamoto - Kazuma Kenzaki - Joji Yuki - Yuriko Misaki
A.R. Evil Kamen Riders: Chinomanako - Mimihiko - Kuchihiko - Kamen Rider Abyss - Dark Kiva - Ryuga - Orga - Dark Kabuto - Alternative
Other A.R. World Riders: Ren Haguro - Scissors - Zolda - Femme - Verde - Tiger - Imperer - Odin - Raia - Gai - Sakuya Hishigata - Mutsuki Kuroba - Takahiro Furuya - Kotaro Nogami - Arata - Ibuki - Zanki - Todoroki - Akira - Junichi Kaito - Haruka Miwa - Shin Magaki - X - Ixa - Saga
Prime Universe Kamen Riders: Kotaro Nogami - Urataros - Kintaros - Ryutaros - Sieg
Drivers: (Neo) Decadriver - (Neo) Diendriver - Kiva-la
Transformation Gear: Rider Cards - K-Touch - Card Holder - Diend Belt
Weapons: Ride Booker - Final Form Rides - Kiva-la Saber
Vehicles: Machine Decader - Machine Diender
Hikari Studio
Natsumi Hikari - Kiva-la - Eijiro Hikari
Other Allies
Ai Yashiro - Kivat-bat the 3rd - Garulu - Basshaa - Dogga - Reiko Momoi - Ai - Mai - Mi - Yuri Tomoda - Toko Yashiro - Deneb - Teddy - Kohana - Naomi - Owner - Toki - Yu - Grandma - Mayu - Natsumi Hikari - Chinatsu - Hikoma KusakabeIcon-crosswiki.png - KurokoIcon-crosswiki.png - Kurando TaniIcon-crosswiki.png - ShinkengersIcon-crosswiki.png - Masahiko Okamura (A.R. World) - Ritsuko Okamura (A.R. World)
Dr. Shinigami - Jigoku Taishi - Apollogeist - Jyumenki Yum Cimil - Shadow Moon - Kingdark - General Jark - Bishum - Yuki - Shvarian - Televi Bae-Kun
Worlds of Black & Black RX: Scorpion Imagin - Seamoon Fangire - Mantis Fangire - Rhinoceros Mutant - Ox Orphnoch - Worm Orphnoch - Frilled Lizard Orphnoch - Brachypelma Worm Aurantium - Brachypelma Worm Viridis - Tarantes Worm Purpura
World of Decade: Siomaneking - Ganikoumoru - Doras - Garai - Me·Vagis·Ba - Xu·Mevio·Da - Me·Ginoga·De - Go·Gadol·Ba - Leiurus Acutia - Formica Regia - Formica Pedes - Sheerghosts - Raydragoons - Psycorogue - Butterfly Orphnoch - Giraffe Orphnoch - Longhorn Orphnoch - Slug Orphnoch - Wild Boar Orphnoch - Pelican Orphnoch - Stinkbug Orphnoch - Arch Orphnoch - Elephant Undead - Giraffa Undead - Darkroachi - Kappa - Bakeneko - Hitotsumi - Coleoptera Worm Aeneus - Coleoptera Worm Croceus - Coleoptera Worm Argentum - Geophilid Worm - Subst Worm - Cassis Worm Gladius - Albinoleo Imagin - Mole Imagin - Rat Fangire - Sungazer Fangire - Bat Fangire
World of Amazon: Go·Jalaji·Da - Propheta Cruentus - Camponotus Worm Maxilla - Bakeneko - Yobuko
Dai-Shocker Combatmen - Dai-Shocker Scientists - Destron Combatmen
Super Shocker
Narutaki - Wasp Woman - Neo Organism
Zanjioh - Jaguarman - Beaded Lizard Man - Hilchameleon - Xu·Goma·Gu - Go·Jalaji·Da - Volucris Falco - Solospider - Scorpion Orphnoch - Titan Undead - Kodama - Sectio Worm Acuere - Cobra Imagin - Gecko Imagin - Sungazer Fangire
Super Shocker Combatmen
World of Kuuga: Me·Garido·Gi - La·Doldo·Gu - Go·Babel·Da - Go·Bemiu·Gi - Me·Byran·Gi - Go·Jaaza·Gi - Me·Garima·Ba
World of Agito: Me·Vagis·Ba - Xu·Mevio·Da - Me·Ginoga·De
The Lords
Taurus Ballista
Formica Regia - Formica Pedes
Mirror Monsters
The Contract Monsters
World of Ryuki: Darkwing - Volcancer - Destwilder - Gigazelle - Abyssodon (Abysshammer - Abysslasher)
World of Negatives: Dragblacker
Wild Mirror Monsters
World of Ryuki: GuldThunder - Zebraskull Bronze - Megazelle - Negazelle - Omegazelle - Magazelle
World of Den-O: Gelnewt
World of Negatives: Raydragoons
Orphnochs / Lucky Clover
Momose - Shukawa - Genda - Shirogane
Butterfly Orphnoch
The Undead
World of Blade: Kamata - Hajime Shijo
Buffalo Undead - Elephant Undead - Capricorn Undead
World of Diend: Fourteen - Bossroach - Darkroachi
World of the Rider War: Deer Undead - Scarab Undead - Lizard Undead
魔化魍 Makamou
Gyuki - Bakegani
Kappa - Bakeneko - Ooari - Tengu - Ubume
Sou Otogiri
Coleoptera Worm Argentum - Geophilid Worm - Subst Worm
The Imagin
Alligator Imagin - New Mole Imagin
The Fangires
Beetle Fangire - Yuki
World of Kiva: Ryo Itoya - Swallowtail Fangire - Lion Fangire
World of the Rider War: Shark Fangire - Silkmoth Fangire - Horsefly Fangire - Warthog Fangire