Hooch
You see it a lot in the Golden Age, characters not fully developed and serving as little more than rough prototypes to be improved on by later writers.

The objective was an exciting lowbrow read and should be read in that light. There was a certain inevitably that, as superheroes enforced the law and socked criminals in the jaw (but the only poet, as far as I know, was barely an anti-hero. I speak of The Demon)that there would be examples of characters who did this in their daily lives as well.

The cop who feels restricted by his badge of office is a common theme and began with The Guardian. He was also interesting in that, rare for a superhero, he was the support character to a street corner gang of youth.
I only know of one boxer and, thanks to the miracle of retconning, Ted Grant/Wildcat is now said to have taught a young Bruce Wayne his boxing skills.

Reporters are plentiful as they are conveniently at the scene of the crime, and millionaire philanthropists and/or industrialists ensure a steady supply of gadgetry and crimefighting capital. Scientists and sorcerors are endlessly inventive in executing their duty.
And all of them provide, in some measure, a counterpoint to their costumed identity; a respite from official duty that is still useful in the key aim of fighting crime.