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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.
Contents
History
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
Profile

Hydragoon
- 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).
Notes
- The first Hydragoon's "eruption" from the Raydragoon is similar to the emerging method of Chestbursters from the Alien franchise.
Appearances
Kamen Rider Ryuki: Episode Final
Kamen Rider Decade
- Episode 1: Rider War
Kamen Rider Wizard
- Episode 53: Neverending Story
Kamen Rider Zi-O
- Episode 47: 2019: Vanishing Watches
- Episode 48: 2068: Ohma Time
- Episode 49: 2019: Apocalypse