Roidmude 012 was one of the Roidmudes who took part in the Roidmude uprising during the Global Freeze. His body was destroyed by the Midnight Shadow Shift Car, but his core survived and was later given a new body.
Alongside Roidmude 055, Roidmude 012 joined the human terrorist organization Neo-Shade and assisted their goals by planting bombs around the city. When the three Kamen Riders raided the Neo-Shade hideout in response to this, 012 and 055 stayed behind to fight off the Riders while Neo-Shade's leader Keisuke Okamura escaped.
012 fought Kamen Rider Chaser was destroyed by him with the Shingou-Ax.