Aoki, also known as the Ox Orphnoch, is one of the three bounty hunters in the employ of Smart Brain. He and his comrades were sent to take back the Faiz Gear from Mari.
Aoki steals a motorcycle to hunt down Mari. However, but he fights Faiz instead and is killed by his Grand Impact.
Kamen Rider Decade
The Ox Orphnoch at some point joined the Dai-Shocker army. He was later summoned by Apollo Geist to fight against Kamen Rider Decade, Diend, Black, and Black RX.