Imu in One Piece

Levely Arc

During the Levely, Imu visited an underground frozen chamber in Pangaea Castle, discovering a large straw hat and carrying wanted posters, including Luffy's. Imu later went to the Room of Flowers, cutting Monkey D. Luffy and Blackbeard's wanted posters and stabbing Princess Shirahoshi's photo.

Alerted that the Five Elders had arrived, Imu met with them, holding a photo of Nefertari Vivi, and the elders asked Imu to reveal the name of the "light" that needed to be erased from history.

Wano Country Arc

During the Levely, Nefertari Cobra visited the Empty Throne room to discuss the absence of official documentation about Nefertari Lili, the Queen of Arabasta from 800 years ago, after the Void Century. As they talked, Imu listened in from the Room of Flowers.

Suddenly, Imu entered the Empty Throne room, sat on the throne, and refused to disclose their identity. Imu revealed that the Will of D. represented the ancient enemy of the government and explained its significance. Imu expressed interest in a letter from Lili that Cobra possessed and ordered him to reveal the full name of its author.

Realizing his imminent death, Cobra confessed that Lili carried the initial "D." in her name. Imu summoned a shadowy tentacle and impaled Cobra. Sabo, overhearing the conversation, attacked the Five Elders and Imu, but Imu nullified Sabo's flames. Despite letting Sabo escape, the Government pursued him. Cobra was killed, witnessed by Wapol through a peephole.

Sabo escaped, gaining knowledge of Imu, prompting the Government to search for him. After the Levely, Imu called the Elders to test Vegapunk's creation, the Mother Flame. Imu ordered its use on the Lulusia Kingdom due to its proximity, disregarding the inhabitants. The Five Elders were also commanded to capture Vivi.

Egghead Arc

The World Government traced Sabo to the Lulusia Kingdom after intercepting a call where he tried to reveal Imu to the Revolutionary Army. Imu eradicated the country with an explosive energy barrage, and the Five Elders declared it never existed. Imu was also observed witnessing the rising sea in the world.

Imu's personality remains largely unknown, but they have shown a particular interest in Monkey D. Luffy, Marshall D. Teach, Shirahoshi, and Nefertari Vivi, as evidenced by keeping their wanted posters or photos during the Levely.

Despite a calm demeanor, Imu exhibits cruelty and apathy, especially compared to the Five Elders. Unlike the Elders, who may hesitate in ordering mass executions, Imu willingly annihilates entire islands, such as the Lulusia Kingdom, to erase them from history, displaying a notable lack of concern for the lives affected.

Imu, despite being a secret figure, revealed themselves to individuals like Nefertari Cobra when questioned about lost records. However, Imu had no intention of letting Cobra leave alive. When Sabo attacked, Imu was furious about their existence being exposed to an outsider.

While initially polite, Imu turned hostile when discussing the Will of D. and had a strong hatred for those bearing the name. Imu uses the pronoun "Mu" for themselves and "nushia" for others.

Imu has only been depicted as a silhouette. The figure appears humanoid, approximately human in scale, with a hand and sharp, almond-shaped eyes featuring red irises and a thin ring around the pupil. Imu wears a crown with four tall spikes and an exceptionally long robe that extends far behind them.

Imu's complete abilities remain a mystery, but their position on the Empty Throne suggests unrivaled authority. While they hold the highest power, Imu relies on the Five Elders to execute their will publicly.

Imu can command the deployment of a potent weapon, the "Mother Flame," designed by Dr. Vegapunk, capable of annihilating entire islands instantly.

In terms of combat, Imu has a saber but hasn't been seen using it. Additionally, they can transform into a massive humanoid creature with fire-consuming abilities and a sharp, tentacle-like appendage for impalement. It's unclear if this transformation is linked to a Zoan-type Devil Fruit.

The Five Elders

Imu holds a position of absolute authority over the Five Elders, who unquestioningly follow their commands. The Five Elders consult Imu on crucial matters, showcasing deep loyalty and trust. Imu's perspective on the Elders remains unknown.

The Will of D.

Imu harbors a strong aversion to individuals with the initial "D." in their names, considering them an ancient enemy. This intense dislike is directed at figures like Monkey D. Luffy and Marshall D. Teach, leading Imu to destroy their wanted posters.

The Nefertari Family, particularly Queen Lili, faces Imu's disdain for their actions during the Void Century, which resulted in the scattering of Poneglyphs.

Nefertari Family

Imu holds disdain for the Nefertari Family, especially Queen Lili, whose actions during the Void Century led to the dispersal of Poneglyphs worldwide. Despite being polite to King Cobra, Imu intended to kill him for becoming aware of Imu's role as the shadow ruler. Imu's anger intensified upon learning that the Nefertari Family carries the initial "D."

Princess Vivi

Imu has an interest in Princess Vivi for undisclosed reasons. After Vivi escaped CP0's custody, Imu ordered the Five Elders to capture and bring her.

Shirahoshi

Imu seems to greatly dislike Princess Shirahoshi, as evidenced by stabbing a portrait of her with a saber. The specific reasons for this animosity remain unknown.

Sabo

Sabo inadvertently learned of Imu's existence during the Revolutionary Army's infiltration of Mary Geoise. Imu became determined to silence Sabo after his escape, considering him a threat to their secret rule over the world.

• In Chapter 793, the existence of a higher authority than the Five Elders in the World Government was hinted at when Fleet Admiral Akainu discovered orders from a superior authority approving Doflamingo's false resignation.

• Emporio Ivankov speculated that Imu might be Saint Imu, a member of the Nerona Family from the First Twenty, who received the "Perennial Youth Operation."

• Marcus Mars referred to Imu as a "Creator," similar to the First Twenty, suggesting a potential connection.

• Imu's name in katakana is formed from radicals representing the character 仏, meaning "Buddha."

• Imu holds the title of ruler of the world, a position sought by the infamous pirate Rocks D. Xebec, but it's unknown if Rocks was aware of Imu or the Empty Throne.

• God Valley, where Rocks met his downfall, was erased like the Lulusia Kingdom and a great kingdom during the Void Century, adding mystery to Imu's role.