Jun Kadowaki

Kamen Rider Gaia is the main protagonist of Kamen Rider Eve -Masked Rider Gaia- and was supposed to be the original Shocker Hopper cyborg until he was put into further stasis and was not awakened until the 21st century. When he first appeared, he was more of a grasshopper kaijin, but later became more similar to the Double Riders while still appearing more organic.

Biography
Jun Kadowaki is a young man who was used by Shocker to become the original Hopper series cyborg but their plans changed after Takeshi Hongo escaped. When the Double Riders destroyed the Shocker base before Kadowaki could be awakened he was buried under the rubble for 30 years. Awakening in the 21st century, Kadowaki has no memories of his past and begins his quest to regain his memories while trying to figure out who turned him into a cybor. Along the way he encounters the remaining Shocker Kaijin while changing from a kaijin to Kamen Rider Gaia.

Kamen Rider Gaia
As one of the original Hopper Kaijin, Gaia possesses abilities like that of Riders #1 and #2. In his original Kaijin form, he was more feral and deadly but after gaining a form like that of the original Riders he becomes less vicious and more heroic.

Machine Crusader
Machine Crusader is Kamen Rider Gaia's Rider Machine. It is similar in appearance to #1 and #2's Cyclones but the front wheel is rotational and possesses blades that can cut through obstacles and be used to attack enemies. The vehicle is also capable of going over most terrains. The back end possesses a smoke screen for easy getaways.