A recent update to the official TV Asahi website has revealed the latest addition to the cast of Kamen Rider Zi-O.
The character is named Schwartz, a member of the Time Jackers. It would appear that he is older than Wool and Aura, which he uses as a reason to look down upon them. Like other members of his group, he is powerful enough to stop the flow of time, but Schwartz is also capable of completely stopping people’s movements. Unlike Wool and the others, he takes a more forcible approach in creating the Another Riders. Whereas his teammates trick people into transforming, he forcibly causes people to transform.
Schwartz is played be Kentaro Kanesaki, a former member of the Prince of Tennis musical cast.
Source: TV Asahi