Ukyo Saionji (
He is one of the Five Wise Generals of the Kingdom of Science. He always proposes the use of non-violence, but will relent if not possible. Because of this, he will push to use Gen's mentalist trickery. Ukyo is in charge of intel gathering and security.
Built similarly to Senku, Ukyo is a slim, yet toned young man of average height, with short, blonde hair and blue eyes. He has round, boyish facial features and often sports a laid-back look on his face. He wears a long, baggy orange top with a loose turtleneck and is rarely seen without his signature, matching paper cap. He's always carrying a bow and quiver on his back, the sling of which features decorative l fur of some kind. He wears long, fitted khaki trousers and distinctively-pointed brown loafers.
Like most modern timers, he has a petrification scar on his body but it is unknown where. He later recreates his unknown scar, as a sign of loyalty to Senku.
He is pacifistic and dislikes needless bloodshed. While he initially joined Tsukasa's empire as he believed it to be the only way of survival and looked away from Tsukasa's breaking of statues (which is the equivalent of murder), he chose to side with Senku and his kingdom of science under the condition that not a single life would be lost.
When Senku fulfills his promise, Ukyo fully sides with the Kingdom of Science. He is notably intelligent, managing to quickly deduce that the Lillian talking over the telephone was Gen in disguise and managing to keep Senku's allies alive while they were in the Tsukasa Empire without alerting Tsukasa's suspicions. He also prefers to use his archery to corner his opponents rather than outright murder them though may be willing to murder if forced to.
Abilities and Skills
Super Sensitive Hearing
As a result of his long career as a sonar technician while working for the SDF Navy, Ukyo now has extremely sensitive hearing which allows him to locate a target with pinpoint accuracy by sound alone.
He has tremendous skill with archery, managing to shoot arrows at Magma and Chrome that made it look as if he was trying to pursue them, but purposely shooting so they would hit close to their bodies, but miss. In addition, he is skilled enough to shoot an arrow to save Chrome from falling in a waterfall. It is unknown whether he learned archery before or after the Petrification.
While chasing Gen, Magma and Chrome Ukyo lured them into bushes where it would be harder to avoid detection through his ears. When Chrome created a smokescreen he took advantage of it by using it to conceal his own position while moving and shooting arrows. Despite Gen managing to perform a perfect imitation of Lilian's voice, he was able to tell that it was Gen simply from deducing that Gen wasn't tired from singing for a long period of time like how the real Lilian (or any other singer) would be after singing an elaborate song.
Ukyo is shown to be bilingual, as he is able to speak both Japanese and English. He spoke English to Senku using his buried phone in order to conceal their conversation from the others present.
Not much else is known about his past but before he was petrified along with the rest of humanity, Ukyo was a sonar technician in the SDF navy.
After being depetrified, Ukyo serves as one of Tsukasa's top lieutenants as a scout.
He finds Gen, Magma, and Chrome while they are setting up a phone and he corners them with his arrows. He captures Chrome. He lies to Tsukasa that they were going for more revival formula, and not making a phone.
After the battle, he along with Nikki are in shock that Senku is planning to create a refrigerator.
After returning to base, Ukyo officially becomes recognized as the Kingdom of Science's Five Wise Generals. They began discussing the new phenomenon and Ryusui dubs the person as the Whyman, something Ukyo comments on. They begin to think Whyman may have been behind the first petrification event and found a way to revive themselves. Ukyo is later impressed by Senku creating a radar. They used the radar to collect several fish. 
After a year of building, he and the Kingdom of Science are able to build the Perseus.
He is one of the few Perseus members to be petrified, since he and the others were attacked by Kirisame. However, he managed to hit the device, indirectly allowing Ginro who was off the ship to survive the attack.
He is later restored by Senku and he bears witness to Mozu finding them, being surprised at not hearing him and worried about his intention. However, he is relieved when Gen manipulates the latter into siding with them to take down Ibara, congratulating the mentalist when he is successful.
He heard Ibara's voice about command before they notice Oarashi running in a frenzy and Amaryllis realizes he plans to head to the island's center to petrify everyone. Shocked, Ukyo has Taiju yell to the others on this. After Taiju tackled Oarashi, Ukyo told him to take the weapon but the man had swallowed it and it activates, to Ukyo's horror.
During the battle with Ibara, he is petrified again but not before shouting the device is voice operated.
After Ibara is defeated, he is restored by Senku. When Whyman contacts them, Senku explains that the radius is the entirety of Earth; meaning Whyman is trying to damn humanity all over again. Ukyo points out Whyman is using Senku's voice.
Ukyo and the others are worried by Whyman having Senku's voice. He soon deduces that the latter is using a synthetic voice.
After the Perseus heads back, Ukyo watches as Tsukasa is revived. Ukyo and the others are rallied by Gen into using war paint to re-adorn their scars until Whyman is defeated.
When Senku explains that Viking sailors reached America 500 years before Columbus. Ukyo and the other crew mates question how the Vikings were able to navigate when the sun was unavailable. He is later excited when they reach America.
After some of the crew were happy to be on land, Ukyo remarks that the crew has had very little meat during the voyage, and Tsukasa notes that the fighters of the crew have been training hard and crave animal protein. Once statues are pointed out to be sitting in the water just off a cape, Senku believes it be the result of a massive car pileup while Ukyo adds on that the cars have corroded away, leaving the drivers behind.
When the group is attacked by an unknown person, they escape on the river. . Ukyo is surprised to hear an engine before he is shocked to witness an aircraft flying above them. Fortunately, Senku has Kirisame bring the plane down using a chemical compound, as the pilot escapes and the plane is salvaged at Senku and Ryusui's urgings.
When the crew gets a call from Chrome and Kohaku, Ukyo watches Senku hang it up because the enemy might track them. Surely enough, the enemy Dr. Xeno makes contact, with Ukyo shocked by this even more so when he requests to speak with Dr. Taiju. Ukyo hears Senku realize that this was a ruse to protect him from harm. He is impressed by Taiju playing the role very well and hears the enemy reveal that they don't have the revival formula. Once Taiju refused Xeno's offer of servitude at the urging of the others, Ukyo heard a noise and was shocked to spot another plane flying above the Perseus. The Perseus crew asks Senku what they should do, as Senku states they’ll battle the enemy in the sky with their new vessels. Ukyo remarks on Senku's tactic, as he announces to the crew that he and Kaseki are building a runway for the Perseus.
Ukyo and his group travel through the forest while wondering about the enemy. 
Ukyo and his group soon find Chrome and Kohaku debating on a plan. The group begin to decide on what plan of action should take. However, they soon get a message from the Perseus, with Ukyo telling his shocked allies that Senku was shot.
However, they soon get a message from the Perseus in our shocked when it is revealed that Senku was shot.
After Chrome announces plan to create a drill, the impressed Ukyo and Tsukasa already knew what it was, to his disappointment. 
They soon receive a message from the Perseus , with Ukyo translating the Morse code before Ukyo is shocked to hear that one of the members of the American colony, Luna, has started a relationship with Senku.
He was initially an enemy to Senku, due to being Tsukasa's right hand man, but sides with him after learning he and Yuzuriha are repairing the broken petrified humans. Ukyo is often amazed by his efforts. He becomes one of the vital assets for the Kingdom of Science due to his perk of superhuman hearing.
- Despite being among the Five Wise Generals, Ukyo doesn't have many chances to use his talents.
|Male||Tsukasa Shishio • Hyoga • Ukyo Saionji • Yo Uei|
|Female||Homura Momiji • Minami Hokutozai • Nikki Hanada|
|Male||Byakuya Ishigami • Gen Asagiri • Hyoga • Ryusui Nanami • Senku Ishigami • Shamil Volkov • Taiju Oki • Tsukasa Shishio • Ukyo Saionji • Yakov Nikitin • Yo Uei|
|Female||Connie Lee • Darya Nikitina • Homura Momiji • Lillian Weinberg • Nikki Hanada • Yuzuriha Ogawa • Minami Hokutozai • Mirai Shishio|