Maro is a Taoist from the Forbidden Continent, a mysterious and distant region inhabited by practitioners of the mystical art of Tao. He was born on the island of Yamto, a faraway land where Taoists mastered the manipulation of ki, or life energy, to perform special powers and spells. Maro is a large, heavyset man with a sumo wrestler-like build, short black hair, and purple eyes. He was one of the earliest members recruited into the Apostles of the Stars, the organization led by Creed Diskenth that sought to overthrow the global order of Chronos. After the group disbanded following their failed revolution, Maro departed and went his own way.

In terms of personality, Maro is easygoing, agreeable, and accommodating, often striving to maintain peace and avoid conflict wherever possible. He does not seek out confrontation for its own sake and tends to act in a calm, measured manner even in battle. His motivations are not driven by ambition or a desire for power; rather, he appears content to use his abilities when necessary and otherwise live without turmoil. This peaceful disposition makes him an unusual member of the Apostles, as many of the other members are far more aggressive or fanatical in their goals.

Within the story, Maro serves as a supporting antagonist during the Apostles of the Stars arc. He is among the more traditional Taoists within the organization, alongside Shiki, and demonstrates a pure, classical form of Tao power that is distinct from the technologically enhanced abilities seen in other characters. His role is to oppose the main characters when the Apostles are active, though his departure after the group dissolves suggests he was not fully committed to the cause beyond his initial involvement.

Maro's key relationship within the series is with Shiki, another Taoist from the Forbidden Continent who uses ink-based spells and insect summoning. Together, the two represent the oldest and most orthodox branch of Tao practice, and they are often mentioned in the same context as bearers of traditional Tao powers. Maro also has a connection to Creed Diskenth, as one of the earliest followers of the Apostles, though his loyalty does not extend beyond the group's existence. His bond with Shiki is the most notable, as they share a common origin and similar philosophical grounding in Tao.

Throughout the series, Maro does not undergo significant personal development or change in his worldview. His arc is relatively static: he joins the Apostles, fights when called upon, and then leaves when the organization collapses. He does not seek redemption, revenge, or transformation, and his departure is consistent with his easygoing nature. If any development can be observed, it is that his preference for peace ultimately outweighs any allegiance to Creed's revolutionary cause.

Maro's most notable ability is his control over gravity within a defined range. He can manipulate gravitational forces to create defensive barriers, such as a gravity wall that deflects incoming projectiles, though this wall has a weakness against attacks fired from above. Offensively, he can amplify his punches with gravitational force to launch devastating strikes, and he can roll his body into a compact ball to crush opponents under increased weight and momentum. Beyond combat, Maro can use his ki to sense other living beings and locate people within a certain perimeter, and he can enhance his own physical abilities through Tao reinforcement. He is also able to detect the presence of dormant Tao power in others, making him perceptive to hidden or latent abilities. His fighting style combines the raw physicality of sumo wrestling with the supernatural manipulation of gravity, making him a formidable opponent in close quarters. Despite his strength, his abilities are limited by range and directional vulnerability, and his preference for avoiding conflict means he does not always fight at full capacity unless necessary.