VA: Akira Ishida, Rikiya Koyama (Japanese), Aleks Le, Fred Tatasciore (English)

Alias: Kamen Rider Ohma Zi-O, Kamen Rider Zi-O, Demon King of Time

Motif: Analog watch, Katakana, Chronograph, Eagle, Demon King

Rider Type: Hero/Anti-Hero/Anti-Villain, Ally

Species: Human

Relatives: Taejin Yeun (father, deceased), Haneul Yeun (mother, deceased)

Occupation: Ruler of Earth

Catchphrase: "You fools could never hope to defeat me. Do you know why? Because I was born to be king!"

Personality

Befitting his title as the Demon King, Taeho is very arrogant due to his tremendous power, proclaiming that he was chosen to be the ruler of the world from birth. He did not even view the resistance fighters as serious threats. His arrogance was not without merit, however, as his power over the Kamen Riders allowed him to effortlessly defeat many enemies. Furthermore, he was extremely confident and fearless.

However, despite this, he was still a kind and benevolent ruler to his subjects, as he wished nothing but best for his people. He also displayed a great love and care for his family and friends, while having so much regrets about his path to kingship has led to many of the people he cared about dying.

After learning that he was manipulated by himself from alternate timeline that led to the death of his enemies who were originally destined to be his best friends, he was devastated and reset the timeline where he never existed before traveling to another timeline. He then transferred portions of his Legend Rider powers to others before erasing his memories and transferring his power as the Demon King into a Ridewatch. After his memories are erased, Taeho is a good-natured young man who lives happily as a high school student.

Biography

Taeho was born to his parents Taejin and Haneul Yeun. On April 24, 2009, he and his parents were involved in a train accident, and was amongst the children teleported away from the explosion that killed the parents. Although he was actually saved by Irene Valentine, Diego Cross, Ben Woods, Grace Moon, and Vick Silver, he wrongfully believed the three to have been responsible for the whole thing and grew up resenting them.

On September 8th, 2018, he eventually obtained his Ziku-Driver and the Zi-O Ridewatch to become Kamen Rider Zi-O. Eventually, Taeho gained the ability to manipulate time however he wanted to and evolved into Kamen Rider Ohma Zi-O from his base form during the events of Oma's Day. Using this newfound power, he destroyed the world using the Dai Mazines, eventually wiping out at least 50% of the Earth's population, and began his rule over the planet.

However, he found himself against Irene, Diego, Ben, and Grace, who transformed into Kamen Riders Kivala, Legend, Juuga, and Zero-Three. Despite this, he managed to defeat Vick, who surrendered and became Kamen Rider Woz, his loyal servant. To prove his loyalty, Vick was ordered to become strong enough to be is retainer by obtaining the four Miridewatches, based on Kamen Riders from alternate futures, including Shinobi from year 2022, Quiz from year 2040, Kikai from year 2121, and Ginga from year 2131.

However, Vick, who was posing as a spy, managed to turn the tide on Taeho, though he survived and retreated.

Later, he discovered that he was never meant to be Zi-O, as he was manipulated by himself from another timeline, where he became Kamen Rider Barlckxs, who also have orchestrated the accident that left him and his family for dead. As Barlckxs absorbed his powers and became Another Ohma Zi-O, he was saved by the five Riders who sacrificed his life for him. He also discovered that in another timeline, they became friends and by extent, a happy family.

Heartbroken and devastated at the fact that his path has led to his friends' deaths, Taeho rewrote the world's history to ensure the world was safe again. He succeeds and managed to revive Irene, Diego, Ben, Grace, and Vick, but at the cost of erasing the memories of his existence from everyone. He then parted to another timeline, happy that his friends would live a fulfilling life.

At some point later, he became a king in a new A.R. World. For reasons unknown, he used his powers to extract the Build, Genm, Blade, Kuuga, and Geats Ridewatches from his power, and then passed on those powers to five individuals in that said A.R. World.

Later, he decides to live as a normal human by transferring his powers and memories into a Ridewatch that he hidden somewhere in his house before.

Powers

Time Manipulation: Befitting his title as the Demon King of Time, Taeho has absolute control over time itself. He is able to fast forward, freeze, and rewind time. He is also able to alter and rewrite timelines itself, and create portals that send himself or others through time.

Legend Rider Powers: As Ohma Zi-O, Taeho has the powers of all the Heisei and Reiwa Riders prior to the year 2068. He can tap into their powers by activating their Ridewatches as well as simply through his will. He can also summon Rider clones and even corrupt the ones summoned by others.

- Kuuga: Summons an energy construct of Linto Hieroglyphics to create an energy kick.
- Ryuki: Summons Dragreder to attack his target.
- Blade: Summons large Rouse Cards to attack his target.
- Kabuto: Can use Clock Up to enhance his speed.
- Kiva: Summons the Bloody Rose violin, allowing him to control a colony of energy bats.
- Double: Summons a green and purple colored cyclones.
- Gaim: Summons Inves to attack his target and generate flora vines from Helheim's Forest.
- Genm: Infect people with Bugster viruses.
- Build: Summons Full Full Rabbit and Tank constructs.
- Zero-One: Summons swarm of metallic locusts to attack his target.
- Saber: Summons all ten Seikens.
- Geats: Summons Boostriker in its fox form to attack his target.

Forms

Kamen Rider Ohma Zi-O

"The Hour of Blessing! The Strongest, Kindest, Greatest, All-Powerful King! Ohma Zi-O!"

"The Hour of End! Ohma Zi-O Finishing Strike!"

Equipment

Ohma Zi-O Driver

Ohma Zi-O Ridewatch