Likewise, due to the character’s role in shows like Supergirl and Young Justice, his popularity has only grown in recent years. Martian Manhunter is a very commonly seen character within the DC Universe and one of the most important members of the Justice League. Martian Manhunter, also known as J'onn J'onzz and John Jones, is a superhero from the planet Mars and the last surviving member of his race.