The Red Angel could be considered an example of a superhero
A superhero was usually a hero that had superpowers and fought evil and upheld the principles of what was generally considered good. They were often considered opposite of supervillains.
Superman, the Shadow and Quasar were examples of fictional superheroes. (Star Trek IV: The Voyage Home; ENT: "Storm Front")
As a child, Khan had action figures of what appeared to be robots or robot-like superheroes. (SNW: "Tomorrow and Tomorrow and Tomorrow")
In 2024, when Seven of Nine beamed from the CSS La Sirena to the streets of Los Angeles, a little girl that spotted her assumed she was using her superpowers to appear there out of thin air. She then asked her "are you a superhero?" Seven then asked if she would keep her secret. (PIC: "Assimilation")
In 2053, during the final year of World War III; a costumed hero who wore an angelic red suit rescued a group of people from a nuclear holocaust in Richmond, Indiana by teleporting them to another world in the Beta Quadrant. This hero came to be called the "Red Angel," and the secret identity of the Red Angel was later learned to be Gabrielle Burnham. (DIS: "New Eden", "The Red Angel")
In 2381, when Brad Boimler decided to become more bold, he imagined himself as a superhero he called Antigrav Boy. (LD: "Room for Growth")
In 3189, when Captain Saru hosted a dinner party for the senior officers, Lieutenant Keyla Detmer had an outburst, and told Paul Stamets that he was only a superhero when he felt like it. (DIS: "Forget Me Not")