Admiral Aramaki burst onto the One Piece stage as a terrifying fusion of nature’s wrath and the Navy’s iron will. This forest-wielding enforcer emerged from the World Military Draft carrying both sword and seedling. His three-year fasting streak defied human biology while his wooden tendrils redefined destruction.
Aramaki possesses the Mori Mori no Mi Devil Fruit in One Piece that transforms him into a Forest Human capable of manipulating all plant life. He is popularly known as Admiral Greenbull within the Marine hierarchy, having advanced Haki techniques alongside his botanical powers. His moisture-draining abilities, fireproof defenses, and relentless belief in Absolute Justice make him a character of his own in the series.
Aramaki was recruited during the World Military Draft that filled two Admiral vacancies, alongside Fujitora, following Kuzan's resignation and Sakazuki's promotion. Serving as a police officer in the Taya Kingdom heavily influenced his strict and uncompromising beliefs. The Marine organization selected him in One Piece specifically for his exceptional combat abilities and unwavering loyalty to absolute justice.

The Mori Mori no Mi, a Logia-class fruit, lets Aramaki generate, manipulate, and become vegetation—earning him the title of Forest Human. This irregular ability in the One Piece series gives Aramaki the absolute manipulation over all forms of plant life. He can convert his body into wood, create massive tree constructs, and generate flowers for mobility.
Aramaki demonstrates the ability to absorb moisture from living beings through direct contact. This technique proves particularly devastating against opponents who require hydration to survive. His wood constructs possess incredible durability and can restrain even the strongest opponents. He can also create plants from his body and can even turn parts of his body into plants.
Aramaki’s Capabilities and Masteries in One Piece

Every Admiral-level Marine officer possesses advanced Haki techniques. Aramaki showcases all three forms of Haki with remarkable proficiency. With Armament Haki, he coats his wooden creations in unseen armor, greatly boosting their strength and resilience. Observation Haki grants Aramaki predictive abilities during combat. And Conqueror’s Haki stands as the most exceptional and uncommon variant of his formidable ability.
Admiral Greenbull's physical prowess in One Piece matches his elevated rank within the Marine hierarchy. His enhanced physique allows him to engage in prolonged battles against multiple high-tier opponents. The Admiral can increase his size dramatically through his Devil Fruit abilities, adding tremendous weight and impact to his attacks.
Despite their immense power, Aramaki managed to subdue and restrain King and Queen, top officers of the Beast Pirates. These individuals possessed bounties exceeding one billion berries, indicating their exceptional combat abilities.
Aramaki’s Role in the Wano Country Arc

Aramaki's introduction during the Wano Country Arc of One Piece showcased his ruthless efficiency. He arrived to capture Monkey D. Luffy following Kaido's defeat. The Admiral's presence immediately escalated tensions in the already war-torn nation. His actions demonstrated the Marine's unwillingness to allow pirate victories to go unchallenged.
The fearsome wood powers can elongate, pierce enemies, and transform the Admiral into a huge Kaiju tree man. During his confrontation with the remaining samurai and Yamato, Aramaki displayed the full extent of his abilities. His massive tree form dominated the battlefield and overwhelmed multiple opponents simultaneously.
The intervention of Red-Haired Shanks ultimately forced Aramaki's withdrawal. The clash underscored just how fragile and shifting the power dynamics are within the world of One Piece. Even Admiral-level Marines must consider the consequences of engaging multiple Yonko-level threats without adequate support.
In short, Admiral Aramaki in One Piece redefined botanical warfare within the Marine organization's elite ranks. His moisture-absorbing techniques, regenerative wood constructs, and Absolute Justice philosophy create a formidable adversary whose influence extends beyond simple combat encounters. As the serues running towards its climactic phases, Admiral Greenbull's wooden grip on justice will inevitably shape the series' ultimate resolution.