TV-Series
Description
King Zen-Oh, also known as the Omni-King, is the supreme ruler of all twelve universes in the multiverse. He is the highest authority in the cosmic hierarchy, a position that places him above all Gods of Destruction, Supreme Kais, and even the Angels themselves. His origins are largely shrouded in mystery, but it is known that he did not create the current multiverse from nothing. Whis once explained that there were originally eighteen universes, but Zen-Oh, in a fit of anger, destroyed six of them, leaving the twelve that exist in the present timeline. This event underscores his absolute and terrifying power, a force that even the most powerful deities, like Beerus, the God of Destruction of Universe 7, fear beyond measure.

Physically, Zen-Oh has a very small, childlike humanoid figure, with a round head that is often described as lemon-shaped, large white eyes, pointed grey ears, and a face marked with purple and blue stripes. He has no visible nose and typically wears a pink or purple vest or robe. On the front of his garment are two kanji characters meaning "all," signifying his domain over everything. This diminutive and whimsical appearance is a stark contrast to the unimaginable power he wields and forms the core of his complex personality.

Zen-Oh's personality is arguably his most defining characteristic. He behaves like a young, spoiled, and easily bored child. He is often cheerful, playful, and eager to be entertained, speaking in a high-pitched, energetic voice. However, his childishness is not merely innocent. Because he has existed for eons as the supreme being, he has developed a troubling detachment from the value of individual lives or even entire civilizations. His decision-making is driven almost entirely by his immediate emotions and whims, without any apparent malice but also without any consideration for the consequences. He destroyed six universes simply because he was in a bad mood, treating the erasure of countless sextillions of lives as an inconsequential act. This lack of empathy makes him profoundly dangerous; as Beerus notes, his danger stems from the fact that he is very nice but lacks the maturity to understand the gravity of his actions.

Zen-Oh's primary motivation appears to be the alleviation of his own boredom and loneliness. For countless millennia, he was surrounded by gods who only treated him with fearful reverence, which left him isolated. This changed when he met the Saiyan, Goku. Unlike anyone else, Goku approached Zen-Oh without fear, spoke to him informally, and even shook his hand, a gesture of friendship that was unprecedented for the Omni-King. Delighted by this, Zen-Oh declared Goku his friend and gave him a special button that would summon him instantly. This friendship is the key driving force behind his actions in the series. After seeing Goku's fight with Hit, he was so entertained that he expressed a desire to see more, which eventually led to his decision to host the Tournament of Power, a massive battle royale featuring the best warriors from most of the universes.

Despite his immense authority, Zen-Oh is largely passive and relies heavily on his attendants. His most prominent attendant is the Grand Minister, an Angel who serves as his advisor and caretaker, effectively managing the day-to-day operations of the multiverse and executing Zen-Oh's often vague or impulsive decrees. Zen-Oh's most significant relationship is undoubtedly with Goku. He treasures Goku as his first and only true friend, finding the Saiyan's carefree and irreverent attitude refreshing. In contrast, all other gods, including Beerus and Champa, are paralyzed with terror in his presence, prostrating themselves and speaking only when spoken to. During the "Future" Trunks saga, Goku brought a version of Zen-Oh from a doomed future timeline to the present. The two Zen-Ohs, the present one and the future one, became fast friends and constant companions, providing each other with the companionship they both craved and acting as a pair of childlike, all-powerful twin rulers for the remainder of the series.

Over the course of Dragon Ball Super, Zen-Oh shows no character development in the traditional sense, as he remains unchanging in his childlike demeanor. However, his role in the story evolves from a distant, mysterious figure of ultimate authority into a more active, if still chaotic, participant. While he is the one who proposes the Tournament of Power, the stakes become dire when the Grand Minister announces that the universes that lose will be immediately erased by the two Zen-Ohs. This reveals Zen-Oh's callousness, as he views the tournament as a fun game, even though its consequence is the annihilation of trillions of beings. In a minor but telling sign of growth spurred by his friendship with Goku, Zen-Oh shows genuine sadness when he thinks Goku has been eliminated and palpable joy when Goku survives. At the tournament's end, it is implied that Zen-Oh may have orchestrated the event not purely for destruction, but as a test, and he allows the victor, Universe 17, to wish for all the erased universes to be restored, showing a flicker of what could be interpreted as a deeper, more calculated wisdom.

Zen-Oh's most notable and terrifying ability is simply called "Erase." With this power, he can annihilate any target from existence, regardless of its size, power, or nature. He has been shown erasing people, planets, entire universes, and even an immortal, dimension-corrupting being like Infinite Zamasu. This act of erasure is permanent and absolute, bypassing conventional immortality or durability. The full scope of his power is unknown, but Whis, his attendant, states that no one is greater than Zen-Oh and that he could wipe out the entire multiverse in an instant if he wished. It is important to note, however, that his power seems to be solely focused on destruction. He cannot create; the arena for the Tournament of Power had to be built by the Grand Minister. He also appears to have very limited combat speed and no fighting skills, as he has never needed to fight. He was unable to track the movements of the speedy warrior Dyspo without assistance, highlighting that while his raw destructive power is absolute, his physical perception is that of an ordinary, if not slower, being. He wields his power not through martial arts, but through simple, declarative commands, often accompanied by a small orb of glowing energy appearing on his fingertips before the target is instantly erased.