Icon-ryuuki.png This article is about a/an Mirror Monster in Kamen Rider Ryuki.

Hydragoons (ハイドラグーン Haidoragūn, Episode Final): Blue dragonfly monsters that are the evolved forms of Raydragoons, and thus the final form of the Sheerghosts. Hydragoons are more dragonfly-like than the other forms and are much larger, with their body and tail being at least 10 feet long. They are able to fly up to 900 kilometers per hour, can launch harpoon-like claws that can retract with whatever they grab, and have fangs that can rip through steel.


Kamen Rider Ryuki: Episode Final

Hydragoon grabs Knight in the air

One bursts out of a Raydragoon that Knight was fighting, chasing him into the sky and snagging him with a harpoon claw, dragging him back to it. Darkwing knocks Knight free, and he defeats the Hydragoon with his Final Vent.

Many more emerge from building windows into the real world in a massive swarm of Raydragoons and Hydragoons, attacking a crowd of civilians before Ryuki Survive and Knight Survive fly into the swarm on Dragranzer and Darkraider, easily taking out individual monsters but being severely outnumbered. Kamen Rider Ryuki: Episode Final

Kamen Rider Decade

Dozens of Hydragoons appeared fighting Ubume and Ittanmomen Makamou in an all-out battle among the various monster groups during the destruction of Natsumi's world. Rider War (episode)

Kamen Rider Wizard

Another massive swarm of Hydragoons joins Amadum's army of his strongest monsters to fight the Heisei Riders, most Riders taking out at least several in one way or another. Neverending Story

Kamen Rider Zi-O

A massive swarm of Hydragoons were one of the various monster groups that were summoned in the World of Zi-O due to Swartz merging all of the worlds of the Kamen Riders together. 2019: Vanishing Watches 2068: Ohma Time 2019: Apocalypse



  • Height: 240 cm
  • Weight: 125 kg

Behind the Scenes

Concept Art

Hydragoons concept art

Hydragoons was designed by Tamotsu Shinohara (篠原 保 Shinohara Tamotsu).


  • The first Hydragoon's "eruption" from the Raydragoon is similar to the emerging method of Chestbursters from the Alien franchise.


See Also

Icon-ryuuki.png Kamen Rider Ryuki
The 13 Kamen Riders
Shinji Kido - Ren Akiyama - Masashi Sudo - Shuichi Kitaoka - Miyuki Tezuka - Jun Shibaura - Takeshi Asakura - Satoru Tojo - Mitsuru Sano - Kamen Rider Odin - Goro Yura
Movie/Special Exclusive: Koichi Sakakibara - Itsuro Takamizawa - Miho Kirishima - Dark Shinji
Stageshow Exclusive: Kamen Rider Papillon - Kamen Rider Cerberus
The Alternatives
Hajime Nakamura - Hideyuki Kagawa
Transformation Devices
Card Decks - V Buckle - Advent Cards
Dragvisor - Darkvisor - Scissorsvisor - Magnuvisor - Evilvisor - Metalvisor - Venovisor - Destvisor - Gazellevisor - Biovisor - Blancvisor - Blackdragvisor - Goldvisor - Slashvisor - Abyssvisor
Sword Vents
Ridesaber - Dragsaber - Winglancer - Venosaber - Wingslasher - Goldsabers - Dragsaber (Ryuga) - Abysssaber - Slashdagger
Strike Vents
Dragclaw - Scissorspinch - Gigahorn - Metalhorn - Destclaws - Dragclaw (Ryuga) - Abyssclaw
Guard Vents
Dragshield - Wingwall - Shelldefense - Gigaarmor Wingshield - Dragshield (Ryuga) - Goldshield
Shoot Vents
Gigacannon - Gigalauncher
Swing Vents
Spin Vents
Hold Vents
Rideshooter - Dragranzer (Bike Mode) - Darkraider (Bike Mode) - Psycoroader
Kanzaki family
Yui Kanzaki - Shiro Kanzaki - Sanako Kanzaki
ORE Journal
Daisuke Okubo - Reiko Momoi - Nanako Shimada - Megumi Asano
Mirror Monsters
The Contract Monsters: Dragreder - Darkwing - Volcancer - Magnugiga - Evildiver - Metalgelas - Venosnaker - Genocider - Destwilder - Gigazelle (Contract Monster) - Goldphoenix - Biogreeza - Blancwing - Dragblacker - Psyco-Rogue
Wild Mirror Monsters: Spiders (Dispider - Mispider - Respider - Solospider) - Zelles (Gigazelle - Megazelle - Magazelle - Negazelle - Omegazelle) - Zebraskulls (Iron - Bronze) - Boarders (Wildboarder - Shieldboarder) - Biters (Zenobiter - Terabiter) - Krakens (Bakraken - Wiskraken) - Gulds (GuldThunder - GuldStorm - GuldMirage) - Abyss (Abysshammer - Abysslasher - Abyssodon) - Buzzstingers (Hornet - Bee - Wasp - Frost - Broom) - Sheerghosts (Sheerghost - Raydragoon - Hydragoon) - Deadlemur - Gelnewt - Sonorabuma - Brobajell - Fake Kamen Rider Agito
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