Kumonjin is jumping spider cyborg of the Neo-Shocker organization and antagonist in episode 2 of Kamen Rider (Skyrider).
He was originally Specimen 105, a prideful middle aged man with a scar on his face. To test his abilities, Kumojin captures Shinichi Takamori, as a candidate for the Remodeling process.
He later encounters Skyrider and, unaware that he is an enemy, unknowingly takes him to Shinichi. Learning too late that the Kamen Rider is a foe of Neo-Shocker, Kumojin is unable to stop him from freeing his captive. The cyborg later goes after Tsukuba to kill him as revenge for taking his captive but is interrupted when General Monster orders him to recapture Shinichi. Kumonjin opts to instead capture his younger brother Kenji Takamori and hold him for ransom. However, his scheme fails again and he is destroyed by SkyRider's SkyKick.
He was later revived as part of the Second Generation Cyborg Corps. They were destroyed by the 7 Riders.