Anteman is actually Chase Koter, son of Jake Koter, a master of past and future, a powerful creator of Earth, who wears no mask for hiding.
When Chase was a kid, he found out that he had the power to go into the future. He can take care of his city, and that's by going into the future and stopping the villains from doing they're plans before they could really do them.
Now he protects his city and keeps trouble away from Dr. Ro Shambo and his forces. His only weakness is if he stays in the future for over two hours, then he will be stuck there forever.