Confidence and success are thought to go hand in hand. If you feel good about yourself, then you’re more likely to achieve what you want in life. But confidence isn’t a limitless resource and there are times when everyone has struggled with low self-esteem. Superheroes are just as prone to losing their self-worth, which is why they are relatable. It’s even more devastating when your superpowers are linked to self-belief. A comic character who represents this concept is Gladiator. Considered to be one of the most powerful beings in the Marvel Universe, Gladiator is only as strong as he believes himself to be.