They are the main enemy in Kamen Rider Fourze. They are human beings that use a Zodiarts Switch to transform a monster based on star constellations. There are two types of Zodiarts: ones based on actual constellations and ones based on the Zodiac. The ones based on the Zodiac are called Horoscopes and are much stronger than the typical Zodiarts. The Horoscopes are created from surpassing Last One which separates the human host from the Zodiarts body. If successful in becoming a Horoscope, the human host is remerged with the new Zodiarts form.

Non Horoscopes

Orion Zodiarts

Actual Name: Miura Toshiya 三浦 俊也

Played by: Mizuno Masanori 水野 真典

Miura Toshiya is a second year student and equipment manager of the American Football club at Ama High. He always wanted to play but Shun wouldn't allow him and forced him to be his own personal servant. That frustration lead him to becoming the Orion Zodiarts. He desired to destroy Shun and the school with his new-found power. Fourze took him to space and defeat him with Rider Rocket Space Drill Kick. After Miura recovered from his defeat, he refused to go to school because he would succumb to the power of the Switch again. It took the support of the Kamen Rider Club and his girlfriend, Yamamoto Mari, to overcome the desire for the Switch. Even though he was offered to join the Kamen Rider Club, he decides to join the photography club with his girlfriend.

Orion Zodiarts possess great strength and resistance while producing explosions from his stars. When going to Last One, he gains a club and shield.

Chameleon Zodiarts

Actual Name: Sakuma Tamae 佐久間 珠恵

Played by: Yoshikawa Maria 吉川 まりあ