As leader of Iscariot, Maxwell rules with an iron fist, instilling the rank-and-file of the organization with the same fanatical fervor he has. But along with his passion, Maxwell also has great ambition, hoping someday to turn the entire world back to the Catholic faith.
Maxwell is also a bitter enemy of Sir Integra Fairbrook Wingates Hellsing, the leader of the Hellsing Organization in England, and is offended that she would employ the very enemy of Iscariot – the vampires Alucard and Seras Victoria – as vampire killers. This shows the very differences the two organizations have: the Hellsing Organization will only destroy vampires that present a danger to the English church, sovereign and people, while Iscariot will destroy vampires regardless to the fact if they attack humans or not... and even humans that oppose Iscariot or the Catholic church. Despite his animosity towards Integra, Maxwell is fascinated by the woman, and will make his interest known to her.
Maxwell also has an unusual tic in his right eye, causing it to wince occasionally and uncontrollably. He's been also known to drool while asleep.