The design of this Kamen Rider Gaia was originally of more a traditional Kamen Rider appearance, before later designs switched to a "Kamen Rider Style Reform" version (resembling a man in a motorcycle helmet and modified riding jacket), and then the mutated insect-like human that would become Kamen Rider Shin.
The design of Kamen Rider Gaia was initially envisioned as a more classic Kamen Rider look, before evolving into a "Kamen Rider Style Reform" version (resembling a person wearing a motorcycle helmet and modified riding jacket), and then the mutated insect-like human that would become Kamen Rider Shin.