When Alpha Danger Squad: Karno's Perfect game gets released later this year, I am hopeful you will like "get" what I'm trying to do. And while I'm a big believer in show-don't-tell, I think you might want to wet your appetite on a bit more of the creative process behind each character. Or whatever.
Bella Wayne was the girlfriend of the hero The Owl. She started assisting him, without any gimmick, but one day she up and moved into costume superheroing.
And so she remained. When I started the story ideas for Alpha Danger Squad one of my key goals is that this was not the beginning of the story by any means. Therefor, the idea of legacy characters is important to that, and Owlgirl fits nicely along that line.
Bella Wayans was a normal teenager girl, by all appearances. But secretly she assisted her teacher Nicholas Terry pursue vengeance on crimedom as The Owl, as his operator: she sought any information he might need, and guided him via voice commands.
Unfortunately Nicholas died. Beset that her friend was gone, she swore to carry on for him.