Generation 1

, or , may refer to any of the following characters.
Kamen Rider G-1 Poster.png| Hydrozoa Tegula|link=Hydrozoa Tegula
==Overview==
G1 is the earliest model of the Metropolitan Police Department's G-Series program, which was designed by Sumiko Ozawa to fight the Unidentified Lifeforms. The G1 model is an armored exosuit that is designed to emulate Unidentified Lifeform #4, even resembling him in appearance (only red #4 was shown in the story, but other forms are also reproduced). This wearing-type model was introduced together with the non-wearing model (G2).
Probably because of the reproduction of the Mighty Form specialized for fighting battles, although it is not equipped with weapons like the later G-Series, the performance itself surpasses that of G3-X and G4. However, unlike G4, which managed to operate by taking the life of the wearer, the G1 is a defective product that cannot be completely handled by humans. Therefore, Sumiko herself sealed it in the underground warehouse of the Metropolitan Police Department along with various of prototype weapons for Unidentified Lifeforms, but the research data on its development laid the groundwork for future models of G-Series weapons.
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