This quote means that when we think of superheroes, we often think of them being perfect, without any flaws. However, this quote suggests that superheroes actually do have flaws and these flaws contain a sense of humor. In other words, the flaws in a superhero’s personality, abilities or their stories can be humorous. For example, a superhero may not be able to fly despite their super strength, or they may have a funny quirk that sets them apart from other superheroes. So, even though superheroes have flaws, these flaws tend to be entertaining.