Exa is the Hero who dreams of monsters and humans co-existing in harmony. He values all monster and human life, and does not wish to kill anyone, firmly believing that the war can end without the complete extermination of one race. Despite his philosophy, he will make an exception for the Demon Queen, whom Exa can never forgive for the atrocious crimes she has committed, as well as for the murder of his family and friends at the hands of the latter. Exa believes that with the death of the Demon Lord, peace could be restored to the world.
While Exa acts cool and collected for the most part, he does loosens up around those he trusts. Exa is a peaceful, kind and calm individual. While calm for the most part, he does become rather short-tempered sometimes, especially around Sheila. Even when he was a boy, he was a pacifist who didn't like fighting, something his neighbors thought was a waste. This attitude is often made evident whenever he refuses to kill other monsters, and prefers to run away from a battle or discuss a solution. This irritates Sheila to no end as it often causes Exa to be in danger (and then she has to rescue him). Coupled with his willingness to give strangers the benefit of the doubt and protect humans and monsters alike, she often calls him naive and a "simpleton".