Yoshio Kobayashi aka the Rabbit Orphnoch is an antagonist in episodes 24 and 25 of Kamen Rider 555.
Yoshio was saved from committing suicide by Naoya Kaido, who took him under his wing after he became an Orphnoch. The two tried out for Lucky Clover and attempted to prove themselves by taking the Faiz and Kaixa belts away from Takumi and Masato Kusaka. Though they succeeded, Kyoji Murakami told the two that only one of them would be allowed join Lucky Clover and offered the position to whicherver one could kill Yuji Kiba. To lure Kiba out, Yoshio kidnapped Yuka Osada, disturbing Kaido with his willingness to play dirty. Yoshio later met his end at the hands of Kusaka after he became Kamen Rider Kaixa again and destroyed him with a Gold Smash.