Mars

Mars is usually friendly, playful and socially comfortable. One of his favorite activities is Asteroid Dodgeball, particularly with Earth, and he tends to approach relationships casually rather than obsessing over status. Unlike Earth, he generally does not need to be the center of attention; unlike Venus, he is usually capable of admitting when someone else has a point.

He is also naturally protective. Early in the series, when Earth considers retrieving an asteroid himself, Mars immediately points out the danger to the Earthlings and offers to do it in Earth's place. This tendency recurs throughout the series: Mars frequently places practical safety above pride and is often one of the first planets to recognize when a joke or conflict has become genuinely dangerous.

Mars possesses a strong sense of right and wrong, but this becomes one of his flaws. During the rocky planets' reconciliation, he openly admits that he tends to believe he knows better than everyone else and often behaves as though he has “moral superiority.” He connects this partly to spending billions of years beside Jupiter, whom he regards as wise and responsible.