Taiju Oki is one of the protagonists of Dr. Stone. He was depetrified on October 5th, 5738 AD. Together with Senku, he nobly aspires to rebuild the lost human civilization by depetrifying everyone caught in the phenomenon that happened 3,700 years ago. Along with Yuzuriha, he joined the Tsukasa Empire, where they would eventually work as spies for the Kingdom of Science until their victory and both factions merged. After rejoining the Kingdom of Science, he is placed as the leader of the Farming Division, while being an asset to the Power Team for his inhuman amounts of endurance. He and Yuzuriha followed Senku as valuable members for the Kingdom's journey towards Treasure Island and America until the second global petrification. Following the seven-year timeskip with the Kingdom and the American Colony resolving their differences, he and Yuzuriha resumed their duties to complete and succeed the Kingdom's moon project where they finally married in the story's finale. Taiju is a tall, muscular young man with spiky brown hair, thick eyebrows, and two vertical stone markings, one of which starts at his hairline above his left eye and reaches down underneath it, and the other one located under his right eye. The markings were later removed after his second revival and replaced with identical ones drawn with paint. He wears a 2-piece, sleeveless cloak that reaches past his knees and is tied together with a rope, and primitive boots. After his second revival, his scars disappeared and he soon adorned war paint in reflection of his stone markings, during Tsukasa's revival. When posing as Dr. Taiju, he wore a lab coat over modern clothing to play the part. Taiju is an outgoing, friendly, and kind person. He's enthusiastic about performing even small tasks and a diligent worker. He is very determined when something is important to him. He tends to yell loudly and is enthusiastic regardless of the task so long as he proves useful. He is persistent and determined. Despite being emotional and expressive, he has great control of his temper, never losing his cool or acting impulsively. He is notably one of the kindest people in the series, refusing to murder Tsukasa and wanting to find peaceful solutions without murder or hurting others as evidenced by his pacifistic nature. He has a straightforward and honest nature, refusing to take a love potion that Senku claimed would make him irresistible and stated he would confess to Yuzuriha on his own. In addition, he tends to easily trust others and believe in the good of others, believing Tsukasa to be a good person when they first met for wanting to eat the meat of a lion he killed as not doing so would be disrespectful of the lion's death. Even after becoming enemies and witnessing him murder Senku, he shows no rage or anger despite greatly mourning his friend's death, instead wishing Tsukasa a benign farewell. He loves Yuzuriha, although he couldn't bring himself to confess his feelings for five years. It was his drive to finally tell her how he feels that allowed Taiju to remain conscious during his several thousand-year petrification. Even after they are de petrified, he has yet to confess his feelings because he does not want her to feel pressured to answer how she feels when he believed they were some of the only few humans remaining. He also refused to de-petrify her until after clothing her, proving to be a gentleman and considerate of the feelings of others. He is a loyal friend and person to those he cares for, placing great trust in Senku and being deeply loyal to Yuzuriha, continuously willing to put his life on the line for the two of them. He greatly admires his best friend Senku, even though he only has a limited understanding of scientific practices. He gets easily impressed by Senku's inventions and he assists Senku with his experiments by providing the manpower necessary for them. Taiju was willing to sacrifice himself in order to let Senku escape from a pride of lions, further attesting to his kindness and selflessness. Despite his massive strength, he is a pacifist who refuses to fight others because he does not want to hurt others. He once even offers to let Tsukasa smack him until he is satisfied in the hopes of deterring him from destroying anymore petrified humans. Nonetheless, he has the endurance and patience to complete any task no matter how arduous. While considered book dumb and not good with science, it is shown that he is capable of finding mundane solutions without science and can apply the science and knowledge Senku imparts on him and use it to his advantage, such as remembering how Senku stated that shells were good for upgrading soil for farming and applying it to his fields, which allowed it to grow in contrast to Yo's and Magma's fields. He can be resourceful and also has a good memory, managing to remember that, in the past, Senku did not have the habit of cracking his neck and figuring out it was a code from Senku. He also knows his limitations and what he is good and not good at without overestimating himself.