"So, see I was thinking, see, maybe next time I'll try gathering fighters from all the universes, see...We'll do a tournament then, see. Sometime soon, see."
Zen-Oh has a very small, childlike humanoid figure. His purple- and blue-striped face can often be seen with a near blank expression. He also has no visible nose. He wears a pink vest on his body, which bears two "all" kanjis (全) on the front. His head has a lemon-like shape, with his two ears being pointed and grey. He also has an extremely high and childlike voice.
Zen-Oh can come off as childlike on many occasions. He can be swayed easily by a good fight, as seen from his interest in setting up a tournament after witnessing Goku's fight against Hit. He also took a liking to Goku, letting the Saiyan talk directly to him and shake his hand to the point of lifting the small deity off the ground. His interest in Goku led him to ask the Saiyan to become his friend, and to have Goku give him the nickname "Zen-chan." He prefers Goku to speak plainly, and is unappreciative (to the point of threatening) of those who attempt to speak in his place. It is possible that Zen-Oh is lonely, as almost nobody knows of his existence, and those who do fear his power, proving a barrier to friendship.
Zen-Oh is shown to be careless, irresponsible, and amoral, having destroyed six of the eighteen universes after a bout of anger, and also destroying several planets in a game he played with his future self 202 times. He apparently wished to decrease that number further for some time, with the Tournament of Power being the perfect opportunity to do so; this suggests that he feels no guilt, compassion, or care for anyone or anything else. To add insult to injury, this indifference seems to extend to the gods themselves and even those he comes to see as friends, like Goku, seemingly rendering him a remorseless being.
At the same time, Zen-Oh is also shown to be flexible, tolerant, and even willing to go back on his word on occasion. For example, he accepted Bergamo's proposal to rescind universal destruction were he to win against Goku, despite his earlier decision. He condoned Toppo's challenge to Goku as an additional fourth match to be witnessed, despite the end of the Zen Exhibition Match.
He does not seem to have a problem with physical contact, even with strangers, as seen when he is unbothered by Goku's lively handshake. When his future counterpart gets hugged by Goku, he likewise seems unphased.
His penchant for physical contact with Goku is likely a result of how surgical and formal people are around him, leaving him feeling somewhat starved for companionship. He appears to find Goku's informal and friendly demeanor to be refreshing after countless eons of being feared and skirted around by his subjects and attendants. He is also impressed and enamored with Goku for the Saiyan's friendship, and appreciates his unconventional approach to life. Case in point is Goku's suggestion to present Zen-Oh to be friends with his future timeline counterpart, thereby giving the King of All a friend that is truly his peer and equal in every respect; that is, one who truly understands him.
Nevertheless, Goku is not the only one Zen-Oh and Future Zen-Oh seem to respect and admire, or, at the very least, find agreeable. Throughout the first match of the Zen Exhibition Match, they seem to take a liking to Buu's nature as well, since he is goofy, high-spirited, childish, and playful, much like the Kings of All.
At some point in time, Zen-Oh destroyed 6 of the then-existing 18 universes.
Dragon Ball Super
Universe 6 Saga
Main article: Universe 6 Saga
Zen-Oh watches the Universe 6 and Universe 7 tournament from a distance away of the Nameless Planet. After the tournament concludes, Champa is angry that his team lost and prepares to destroy them while Beerus desperately warns Goku that he can't beat Champa yet. However, Zen-Oh and his attendants arrive on the Nameless Planet in the ring, which prevents Beerus and Champa from doing so, as he along with Beerus are completely mortified and shocked by Zen-Oh's presence. He states that his reason for visiting was out of concern that Beerus and Champa were shirking their duties as Gods of Destruction. Asking how Beerus and Champa were doing in their jobs, Whis informs him that Beerus focuses more on sleeping and consuming food, and Vados notes that Champa completely obsesses over food and all of the sweets that result in him being fat, and whatever food Vados serves Champa, he says it is awful.
Goku attempts to meet Zen-Oh, but Zen-Oh's attendants shield the king from him. Zen-Oh allows Goku to speak to him, and even shakes hands with Goku after a long pause when the latter offers his hand. After shaking hands with Goku, Zen-Oh returns home via his attendants.
"Future" Trunks Saga
Main article: "Future" Trunks Saga
While Beerus and Whis are at their temple, Beerus is waiting for his food when a call comes through. Beerus answers it, telling the caller to call another time, yet is immediately shocked and terrified to see his caller is Zen-Oh, and repenting his tone, immediately bows to him, accidentally breaking his table with his head in the process, and asks him how his day has been, thanking him for taking the time out of his schedule to call him.
As he was told, Beerus orders Whis to take Goku to Zen-Oh's place together with Shin. Zen-Oh happily greets Goku and asks him to be his friend, since everyone else was too afraid of his power to effectively socialize with. When Goku seemed to hesitate, Shin desperately interrupts, saying Goku would be happy to oblige, but Zen-Oh orders him to be silent and allows Goku to answer for himself. Agreeing to be his friend, Goku tells Zen-Oh to just call him by his name and, in return, Goku will call him "Zen-chan," to the shock of those present. Then, Zen-Oh gives Goku a button. If Goku presses it, the Omni-King will come right to him.After Fused Zamasu and the future timeline's world are destroyed and erased, Goku and Future Trunks return using Cell's Time Machine. There they find an empty cyan void with Future Zen-Oh floating in the emptiness. They decide to take that timeline's Zen-Oh to the present so that he and his present timeline counterpart can be friends.
Universe Survival Saga
Main article: Universe Survival Saga
Some time after the defeat of Zamasu, Zen-Oh and his future counterpart are visited by Goku, who reminds the former of the tournament promised to the Saiyan after the conclusion of the previous tournament. The Zen-Ohs agree to hold the event, much to Goku's delight. The prize for the winner are the Super Dragon Balls, much like the contest between Champa and Beerus before. However, the Tournament of Power has a dire rule: all of the universes defeated in it are to be erased by the ruling duo.
Before the Tournament of Power is held, however, Future Zen-Oh requests his present counterpart host a preliminary tournament to raise his expectations for the upcoming all-universe event. Their servant, the Grand Priest, willing obliges and has both Universe 7 and Universe 9 gather three warriors each to compete in the contest. The former universe picks Buu, Gohan, and Goku to compete, while the latter selects the Trio De Dangers, a fearsome trio of lupine siblings: Basil, Lavenda, and Bergamo.
Above an arena materialized specifically for the matches, on the World of Void, all of the gods, the Supreme Kais, Gods of Destruction and Angels, as well as the Zen-Ohs and their attendants gather to spectate the matches, with the rules being laid out soon thereafter.
The fights are then determined, with Buu fighting Basil, Gohan fighting Lavenda, and Goku fighting Bergamo, and they then watch the first clash, between Basil and Majin Buu, with the latter coming out as the victor.
Zen-Oh makes his debut appearance as a playable/support-type character in Super Dragon Ball Heroes, being introduced in the first mission of the original series.
Zen-Oh is the most powerful character in the entire Dragon Ball franchise. While the true capabilities of Zen-Oh are unknown, as Beerus notes he does not fight, Zen-Oh possesses enigmatic power far beyond comprehension. Whis states that nobody in this world is greater than Zen-Oh, as the King of All has the power to instantly wipe out anything (or everything) in the blink of an eye, including individual people, planets, galaxies, and even universes. If he so wished, he could erase all existence.
According to Whis, there used to be 18 universes but Zen-Oh destroyed 6 of them when he was in an unpleasant mood. Even when Black and Future Zamasu killed all the other gods of Future Trunks' timeline, Shin—with no hesitation—assures that Zen-Oh is still alive, noting that no matter what, the Omni-King cannot be undone.
Beerus states that if Zen-Oh felt like it, he could wipe out all 12 universes in an instant. Zen-Oh is therefore the single most significant person in existence, and holds complete authority over everything.
- Flight - The ability to take flight with and/or without ki.
- Erase - The ability to destroy anything/anyone and/or everything/everyone with twin-charged balls of blue energy. This includes immortal beings, since it eliminates every single trace of any entity, both material and immaterial.
- Japanese: Satomi Kōrogi
- European Portuguese dub: Rui de Sá
- Although Whis says there is not a single person greater than Zen-Oh, it is not known if this statement is true, as Daizenshuu 7 claims that Akira Toriyama himself is the ultimate ruler of the Dragon Ball world.
- The symbol on his shirt may be a word play on his overall name, since the word "king" (王, ō) is also contained in the word "all" (全, zen)
- In Dragon Ball Xenoverse 2, there is a pose referred to as "Zen-Oh Jump" which appears to be the pose Zen-Oh makes in the Yoka Yoka Dance ending theme.