Sticking to the comics, some in-story consideration is often paid to a superheroes look and the impression it makes. Writers have retroactively explained Superman’s lack of a mask as an asset to help people feel at ease with a inhumanely powerful sentinel. In New Frontier, Darwyn Cooke writes that Batman changed from his long-eared animalistic 1939 look to his Dick Sprang-era look after his 1939 costume made a kid freeze up, saying something like, I want to frighten criminals - not terrify children. And even in the newest Spider-Man flick, an unknown Spidey has to remove his mask to assure a kid that he’s “just a guy.”
So, ignoring their deeds and dispositions which they became known for over time (friendly neighborhood reputations), which ones look the friendliest?
Speaking of which, consider the Challengers Of The Unknown: reassuring and kid-friendly authority figures decked out in matching lavender uniforms, each complete with a badge-like emblem and white gloves.