If he had a secret identity, I’d like him to have a different type of career than every other hero. Everyone us so successful. Why can’t one person work retail or be a purchasing person in state government. Maybe he doesn’t know what he wants to do yet & is flipping burgers. Everyone is a freaking scientist or millionaire.
Hopefully no other ID though. I like the idea he’s just one person all the time. I also like giving him his own costume. Doesn’t have to have a cape or even the same colors. Doesn’t have to be consistent. Maybe he doesn’t always wear the uniform when he’s in action. If isn’t hiding an identity, he can go out in regular clothes.
As far as personality, I’d like to see him a bit more proactive rather than reactionary. I’d like to see someone aggressive even if that means they make mistakes.