Kamen Rider ZI-O is latest, but last, Heisei Kamen Rider series. The show features Kamen Riders from the past and future.
It was recently announced that a new Kamen Rider was joining the team. Besides from the primary protagonist, Kamen Rider ZI-O and Kamen Rider Geiz, there is a fourth Rider joining the team. Beginning from episode 17 on January 6, 2019, Kamen Rider Shinobi will make his debut.
Episode 17 marks the beginning of a new chapter of Kamen Rider ZI-O.
Playing Kamen Rider Shinobi is Hideya Tawada (多和田任益), who appeared in Shuriken Sentai Ninninger as Kinji Takigawa/Star Ninger in 2015. In Kamen Rider ZI-O, he will portray a character named Rentarou Kagura. It is unknown if his character will befriend or attempt to do harm on ZI-O and Geiz.
It was previously announced that the mysterious character Woz, played by Keisuke Watanabe (渡邊圭祐), would also transform into Kamen Rider Woz.