Swartz

Swartz (スウォルツ Suworutsu), alternatively spelled Schwartz or Suworutsu, is the leader of the Time Jackers and the main antagonist of Kamen Rider Zi-O. He is a denizen from another timeline and the eldest child of a mysterious royal family. However, after he was denied succession to the throne in favor of his sister, Alpina, Swartz orchestrated a plan which instigated a majority of events by indoctrinating Sougo Tokiwa to pursue the destiny of a "king" as Ohma Zi-O; all for the goal of becoming the king of time itself and saving his world. After absorbing Tsukasa Kadoya's powers, he becomes Another Decade (アナザーディケイド Anazā Dikeido), an Another Rider derived from Kamen Rider Decade.