Mark/Invincible is a brave, competitive, nice and noble hero and is true to his own values, especially when he discovers the harsh realities of being a superhero, struggling to define himself as one, while struggling to balance lives in danger to balancing actions with schoolwork. However, underneath this lies insecurity and doubt within the young hero. Early on in his career, he did not consider himself to be strong enough to be a hero, let alone be like his father, Omni-man.