This question is for ‘hero’ in all forms: realistic, fiction, superhero, comic book, anime, etc. Let’s say a person is flawed, or is very arrogant, or has a superiority complex, etc., but also does heroic things—like being a firefighter, doctor, wizard, superhero, whatever. Do you think that person is still a hero despite having negative personality traits?
Of course not.
If a fictional character is a perfect hero, then you’re either writing for five year olds or a terrible author.