Okay, let's start with the Black Owl.
The Black Owl is Walt Walters. He is the father of superheroes Yank and Doodle. When Walters dons the mask, his children are unaware of his secret identity at first, but they do become the first crime fighting family in the history of comic books. Walters is an athletic college professor. He discovers his sons are the heroes Yank and Doodle just before he decides to take up the mask himself. Along with some assistance from another hero, he invents an owl-like vehicle.
Unsurprisingly, given the time of his publication, chief among his adversaries are the Nazis of Germany, particularly as they abduct him and his family and murder his wife shortly after she gives birth to his twin sons, Yank and Doodle.
He has occasionally possessed the powers of a living black hole, but most of the time he is just a capable fighter with no powers.