Kamen Rider 4's design is so badass, especially the mouthpiece which is a homage to Riderman's (the actual 4th Kamen Rider) exposed mouth. : r/ KamenRider
Bokura no Riderman | Kamen Rider Wiki | Fandom
Joji Yuki | Kamen Rider Wiki | Fandom
Riderman | All Kamen Rider Generation Wiki | Fandom
Kamen Rider Riderman by doneplay on DeviantArt
Kamen Raid� Yongo Raid�man - Kamen Rider 4 Riderman - Masked Rider 4 Riderman