Masamune Dan/Kamen Rider Cronus

"administer Kamen Rider Chronicle from now on...and will be the judge of your fates. I set the rules of this world."

- Cronus now oversees Kamen Rider Chronicle and the fate of the Kamen Riders and Bugsters. Masamune Dan is the founder of Genm Corp., the father of Kuroto Dan, and the primary antagonist of Kamen Rider Ex-Aid, having manipulated the events of the series to further his own goals.

Though he keeps up the guise of a friendly and benevolent businessman, Masamune's true personality underneath is that of a self-centered sociopath and manipulator who cares for nothing but his own goals, being willing to kill thousands of people in order to achieve them.

He addresses each of the Kamen Riders and Bugsters by the Rider Gashats they use or in the game they originated from, viewing them not as living beings but as products of the Genm Corp and even refers to killing them off as "discontinuing a product".

For the first half of the series, Masamune keeps up the facade of a well-meaning CEO and father while he is behind bars and Kamen Rider Chronicle is in development. However, after he is released from jail and his plans start to come to fruition, Masamune reveals himself to be a tyrannical control freak who believes he has the right to control everyone's fates and is willing to do whatever it takes to see the end result of his goals, including resorting to underhanded and deceitful tactics.

Even after he has been defeated, Masamune clings to his belief that he is the controller of everyone's lives, and kills himself purely out of spite to preventing the victims of Kamen Rider Chronicle from being saved.

In Another Ending, however, it's also revealed that Masamune genuinely loved his wife, as her getting infected with the Bugster virus serving as the catalyst to his and Kuroto's villainy. He also expresses his remorse following his resurrection and is horrified to see his son going off the deep end when the latter instigated Zombie Chronicle.