Some of the best character exploration in superhero comics comes not from how superheroes are seen by 'regular' people, but by how they interact with their peers.
Giving a character a foil, a love interest or sidekick can highlight elements of their personality that we otherwise might not see. It allows the reader to get caught up in the soap-opera elements of comic book storytelling, and deepen stories that might otherwise be no more complicated than good vs evil.
"What if Robin turned evil?" or "what if Blue Beetle got murdered?" would mean so much less without the years establishing their relationships to other characters, so we can see how these stories impact those around them.
A truly interesting and well-written superhero duo emphasises the differences between the two characters, and explores why these differences matter in relation to their fight against crime. A best friend's loyalty assuaging doubts about the life they chose, or a husband and wife terrified that their next big supervillain fight might be the one that widows them.
These partnerships are what make the mightiest immortals human, and allow the reader to identify with deathless gods, arrogant time-travellers and genius billionaires.