Those characters have all had the origin of their powers put in question at some point.

Blacklight is looking for the origin of her newfound powers.

He explains to the heroes the true cause of their accident and the origins of their powers.

Her father, Storybook Smith, had carefully written a story on the origins of her powers many years earlier.

They identified themselves, and Druid revealed the origin of his powers.

It had more details about the origin of the Captain Barbell and his powers.

Thus, for most of the series, the origins of his powers and appearance are a mystery to readers.

The origin of her powers is unknown, but she views them as being a heavenly gift.

Instead, his past was a mystery, just as the origins of his costume and his powers.

The origin of her powers, nature of her dice, and the relationship between them are unknown.