TV-Series
Description
Taiju Ōki is a tall and powerfully built young man with spiky brown hair, thick eyebrows, and a notably muscular frame. He stands 189 cm tall and weighs approximately 95 kg. A distinctive feature of his appearance is the pair of vertical stone markings on his face, with one descending from his hairline above his left eye and the other located beneath his right eye. After being revived from petrification a second time, these markings fade and are later replaced with identical ones drawn as war paint. His typical attire in the Stone World consists of a simple, sleeveless knee-length cloak tied with a rope, paired with primitive boots.

Born in modern Japan, Taiju lost his parents at a young age, an experience that profoundly shaped his desire to protect others. He formed an inseparable childhood friendship with the brilliant but eccentric Senku Ishigami, often serving as the brawn to Senku's brain in various school projects, such as building rockets. Taiju has harbored deep romantic feelings for his childhood friend, Yuzuriha Ogawa, for years, but his shyness prevented him from confessing.

On the day he finally resolved to tell Yuzuriha how he felt, a mysterious global cataclysm instantly petrified all of humanity. While trapped in stone for over 3,700 years, Taiju's consciousness remained remarkably active. His singular determination to confess to Yuzuriha and to see his friends again gave him the mental fortitude to endure the millennia, eventually allowing him to be one of the first to naturally break free from his stone prison. Upon revival, his immediate priorities were locating the petrified statue of Yuzuriha, which he found still standing beneath the tree where he had attempted his confession, and reuniting with Senku.

Taiju's personality is defined by an unwavering and boisterous enthusiasm, combined with immense kindness and a remarkably pure heart. He is famously a pacifist, possessing incredible physical strength but refusing to ever throw a punch or harm another person, believing that violence is never the answer. Even when facing lethal threats, his instinct is to endure blows in order to protect others without retaliation. He is fiercely loyal, especially to Senku and Yuzuriha, and is willing to put his own life on the line for them without a second thought. While he is not academically inclined and often has a simplistic or straightforward way of thinking, which Senku affectionately calls being an "oaf," he is far from foolish. Taiju possesses a practical resourcefulness, a good memory for things that matter to him, and an intuitive ability to see the good in people, which allows him to connect with others on a genuine level.

His primary motivation throughout the story is twofold: to confess his love to Yuzuriha and to protect her, and to assist his best friend Senku in rebuilding human civilization from nothing. He believes in Senku's dream completely and provides the relentless physical labor required to turn scientific theories into reality. His love for Yuzuriha is his greatest driving force, but he is also a gentleman who insists on respecting her dignity, refusing to revive her from the stone until she could be properly clothed.

Taiju plays a crucial role as the foundational powerhouse of the Kingdom of Science. He is the engine that powers many of Senku's early experiments, capable of performing grueling manual tasks that would be impossible for anyone else. In the early stages of rebuilding, his role evolves into that of a spy when he and Yuzuriha pretend to join the Tsukasa Empire, feeding valuable intelligence back to Senku. After the factions merge, he becomes the leader of the Farming Division, applying scientific principles learned from Senku to revolutionize agriculture. He is also a core member of the Power Team, relied upon for his extraordinary physical capabilities in construction, resource gathering, and combat support, though he acts solely as a shield or a mover, never an aggressor.

His most significant relationship is with Yuzuriha Ogawa. The two share a deep, mutual affection that has existed since childhood. Their bond is the emotional core of his character, and the story follows their journey from unspoken feelings to a steadfast, familial partnership. They are constantly together, supporting each other through every challenge. Equally important is his bond with Senku Ishigami. Theirs is a classic partnership of heart and mind. Senku provides the plan and the knowledge, while Taiju provides the trust, the loyalty, and the sheer physical will to see it through, no matter how insane the plan might seem.

Over the course of the narrative, Taiju develops from a love-struck high school boy into a confident and reliable leader. His initial shyness in romance gives way to a mature, protective, and openly devoted partnership with Yuzuriha. While he never loses his simple, earnest nature, he gains a greater sense of responsibility and practical wisdom. He learns to apply the scientific lessons Senku teaches him, moving from just a source of muscle to a competent farmer and a trusted member of the team who can be left in charge of essential tasks.

Taiju's abilities are almost entirely physical, but they are of a superhuman caliber. His most notable trait is his immense stamina, which seems nearly limitless. He has been shown to run 80 kilometers in just five hours without significant rest and can perform repeated deep-sea dives without any oxygen equipment while carrying heavy loads. He possesses incredible durability, being able to withstand direct kicks and attacks from the series' most powerful fighters and get back up almost immediately. His strength is formidable, allowing him to hurl massive boulders, carry multiple stone statues at once, and restrain powerful adversaries. His greatest ability, however, is his mental resilience. He is one of the very few people known to have maintained full consciousness throughout both global petrification events, a testament to his unbreakable willpower. While he struggles with complex scientific theory and academic logic, he is a fast learner for practical applications and has even shown a talent for acting, successfully impersonating a scientist in a high-stakes situation. He also has a basic understanding of English, though his fluency is limited.