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"Shooting people with machine guns without warning isn't nice!"

— Taiju Oki to Dr. Xeno, Dr. Stone, Chapter 152

Taiju Oki ( (おお) () (たい) (じゅ) Ōki Taiju) is one of the protagonists of Dr. Stone. He was depetrified on October 5th, 5738 AD.[16]

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.[1]

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 Oki Icons

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.[17]

When posing as Dr. Taiju, he wore a lab coat over modern clothing to play the part.[18]


Taiju is an outgoing, friendly, and kind person. He's enthusiastic about performing even small tasks and a diligent worker.[19] He is very determined when something is important to him.[20] 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.[21]

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.[1] 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.[22]

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.[23] Taiju was willing to sacrifice himself in order to let Senku escape from a pride of lions, further attesting to his kindness and selflessness.[24]

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.[22] Nonetheless, he has the endurance and patience to complete any task no matter how arduous.[25]

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.

Abilities and Skills[]

  • Enhanced Physical Prowess: Taiju possesses an extremely sturdy body, something his friend Senku vouches for. He is strong enough to restrain Oarashi, who previously threw off Magma and Kinro at once.
  • Immense Durability: He is the first human to be able to withstand a kick from Tsukasa[22] without immediately losing consciousness, opening his eyes as soon as Tsukasa leaves with Senku, saying he needs no recovery at all. He took a hit from Moz, while earning praise for his endurance. In spite of that he was easily gone down from the shots of soldiers following Stanley.
  • Immense Stamina: He also possesses immense stamina, able to cross 80 kilometers in five hours (16 km/h or 9.94 mph). Gen Asagiri has also noted that his stamina is immense. He is also the strongest man for endurance after Tsukasa was put in cryosleep and Hyoga was incarcerated. Magma, Ginro, and Yo notably respect Taiju due to his perk of "limitless stamina" that surpasses even the strongest man in Ishigami Village. He was able to make several trips underwater, without the need of an oxygen tank all the while carrying several statues. This feat left both the modern timers and stone world people amazed.[26]
  • Enhanced Strength: Taiju, besides his sturdiness, is also considerably strong. He was able to hurl a huge boulder at Tsukasa's location high enough to make it fall not before Tsukasa kicked the gunpowder to spread it in order to spark an explosion.[21] He also carried all the statues of his petrified friends, greatly impressing Ryusui Nanami, Gen Asagiri, Soyuz, and Suika. [26]Taiju is strong enough to restrain Oarashi, who previously threw off the combined force of Kinro, Magma and Nikki with little effort.
  • Mental Resilience: Besides Senku, he remained awake for centuries while petrified because of his strong willpower and desire to confess to Yuzuriha.[1] Working in pair with his stamina and personality, Taiju has an unyielding amount of determination, and will complete his task no matter how arduous or long it is. Even at the face of his friend's death, he refuses to believe Senku's fate and through perseverance, eventually finds the key to reviving him. When revived after being petrified a second time, Taiju stated he was awake the whole time.[27] Dr. Xeno makes a remark that only a very small number of humans can hold their consciousness together for 4 millennia, doubting that the entire Perseus group are "mental champions of the highest order".[28]
  • Bilingualism: Taiju speaks Japanese and a little of English. He was initially unable to understand Senku and Ukyo when they had a conversation in English. Later on, he is able to understand Dr. Xeno when he switches over from Japanese to English on the radio. When speaking to Carlos and Max, his English is shown to be very poor, as he could barely understand them (and vice versa).


  • Low Intelligence: For a high schooler, Taiju is incredibly unintelligent. He mindlessly suggested that calcium carbonate Senku was looking for could be found in gym storerooms, despite all of the buildings being completely demolished by the passage of time. He also comically suggested that the most important tool for civilization is a cellphone.[29] Taiju is shown to possess below-average logic and knowledge, easily on par with the Ishigami Villagers (minus Kaseki and Chrome) in how little scientific knowledge he possesses. For example, at one point, he thought the base component for gunpowder would be fireworks (it's the other way around). It is safe to assume Taiju did poorly on tests. Nevertheless, Taiju has his bright moments, such as suggesting that Senku and he make wine through grapes that he found earlier.[23] He also possesses some knowledge in farming thanks to Senku. He also managed to understand the situation when he was revived by Ryusui underwater.

Chapter Appearances[]

Chapter Appearances
Stone Formula Arc
1. Stone World Debut
2. Fantasy Vs. Science Appears
3. King of the Stone World Appears
4. Pure White Shell Appears
Vs. Tsukasa Arc
5. Yuzuriha Appears
6. Taiju vs. Tsukasa Appears
7. The Gunpowder Adventure Appears
8. Raise The Smoke Signal Appears
9. Senku vs. Tsukasa Appears
10. Student of Science Appears
11. Weapon of Science Appears
12. Epilogue of Prologue (End of Part 0) Appears
Kingdom of Science Arc
13. Part 1: Stone World: The Beginning Fantasy
14. Those Who Have Faith Appears
15. Two Kingdoms of the Stone World Appears
16. Kohaku Absent
17. Nasty Looks Absent
18. Sorcery Showdown Absent
19. Two Million Years of Being Absent
20. Stone Road Absent
21. Dawn of Iron Absent
22. Survival Gourmet Absent
23. The Smooth Talker Absent
24. Lightning Speed!!! Absent
25. By These Hands, the Light of Science Absent
26. A Shadow Alliance Absent
27. A Certain Scientists Wish Absent
28. Clear World Flashback
29. Senku's Lab Absent
30. Death Green Absent
31. Friends Have Each Other's Backs Pictured
32. Brain & Heart Absent
33. Baaad Chemicals Absent
Village Origins Arc
41. Doctor Stone Absent
42. Tale for the Ages Flashback
43. Humanity's Final Six Flashback
44. One Hundred Nights, One Thousand Skies Absent
45. Epilogue of Part 1 (End of Part 1) Part 2: Stone Wars Absent
Vs. Hyoga Arc
46. Stone Wars Absent
47. Science Vs. Power Absent
48. Blades of Science Absent
49. To the Present Absent
50. Humanity's Greatest Weapon Pictured
Communications Arc
51. Sweets for the Stone World Absent
52. Age of Energy Absent
53. Hard Knocks Crafting Club Absent
54. Flickering Blue Jewel Absent
55. Treasure Dungeon Push Start Fantasy
56. The Treasure Absent
57. Heat Heart Absent
58. Wave of Science Absent
59. Voices from Here to Infinity Absent
60. Angel's Song, Devil's Whisper Absent
61. Stone Wars Begin Fantasy
62. Double Chase Absent
63. Information Warfare Absent
64. Hotline Appears
65. Call From the Dead Appears
66. Liars and Truth Tellers Appears
67. Full Mobilization Appears
68. Flame of Revolution Absent
69. Steam Gorilla Absent
70. Paper Shield Absent
71. Prison Break Fantasy
72. Experience Points Absent
73. Top-Secret Mission Appears
74. Fateful 20 Seconds Appears
75. 20-Second Countdown Appears
76. Final Battle Appears
77. The Power of Science Appears
78. That Which Destroys or Saves Appears
79. For This Very Moment Absent
80. Humanity's Strongest Tag Team Absent
81. Fingertip Absent
82. Epilogue of Stone Wars (End of Part 2) Appears
Age of Exploration Arc
83. Dr. Stone Mentioned
84. People = Power Appears
85. Ultimate Resource Appears
86. Money Appears
87. Senku's Department Store Appears
88. Wings of Humanity Appears
89. Adventures Absent
90. New World Map Absent
91. Need Bread? Start with Wheat Appears
92. Desire is Noble Appears
93. The First Shot Is Yours Appears
94. The Scent of Black Gold Appears
95. First Contact Appears
96. Eye of Science Appears
97. The Joy of Leadership Pictured
98. Ryusui Appears
99. Kingdom of Science Photo Journal Appears
100. Origin of the 100 Tales Appears
Treasure Island Arc
101. Treasure Chest Appears
102. Perseus, Ship of Science Appears
103. Light of Hope and Despair Appears
104. Men of Forensics Absent
105. The Island's Great Beauty Petrified
106. The Secret of Petrification Absent
107. To the Trump Card Science Vessel Absent
108. Two Trump Cards Absent
109. The Great Escape Absent
110. Beautiful Science Absent
111. Science Wars Absent
112. King of Three Dimensions Absent
113. Cryptography Science Absent
114. Silently, Science Pierces the Stone Fantasy
115. One Second, One Grain Absent
116. Miracle in Hand Appears
117. The Kingdom of Science Strikes Back Flashback
118. Silent Soldiers Appears
119. Science Soldiers Appears
120. Top Secret Absent
121. Medusa's True Face Absent
122. Brain-Battle Puzzle Pieces Appears
123. The Battle of Wits' Deal Game Appears
124. The Invention of God and the Devil Appears
125. The Decisive Three-Dimensional Battle Pictured
126. A 3-D Strategy Appears
127. Medusa and Perseus Pictured
128. Island-Wide Battle Royale Appears
129. Joker Pictured
130. Devil's Choice Pictured
131. Nasty Crimes Appears
132. The Strongest Weapon Is... Absent
133. Flash of Destruction Appears
134. Commander Faceoff Petrified
135. Counting Absent
136. Medusa Vs. Science Absent
137. Last Man Standing Petrified
138. End Of Part 3 Appears
New America City Arc
139. First Dream Appears
140. New World Plots Appears
141. First Team Appears
142. World Power Appears
143. Ryusui vs. Senku Appears
144. Ryusui & Gen vs. Senku & Kohaku Appears
145. Bar Francois Appears
146. Bar Francois: Bitters Absent
147. Science Journey Appears
148. Pioneers of Earth Appears
149. Light Lure in Darkness Appears
150. Righteous Science User Appears
151. Dr. X Appears
152. Doctor Vs. Doctor Appears
153. Science Wars Appears
154. Spy vs. Spy Appears
155. Science Is Elegant Appears
156. Two Scientists Flashback
157. Same Time, Same Place Flashback
158. Who's the Scientist? Appears
159. Lock On Absent
160. Gunshots Echo Appears
161. Craft Wars Pictured
162. Down the Earth-Stained Path Appears
163. Multifront Final Battle Appears
164. Re-Lock On Absent
165. Know the Rules, Make the Rules Absent
166. Ultimate Knight Absent
167. Different Strokes Pictured
168. Corn City: Population One Million Appears
169. RISK or HEART Appears
South America Arc
170. Staring Up at the Same Moon Absent
171. Staring at the Same Light Absent
172. Marked with an "X" of Wisdom Appears
173. Earth Race Appears
174. The Specter of the Panama Canal Appears
175. Ultra Race Across South America Appears
176. Net-Breaking Battle Plan Appears
177. Medusa Mechanism Appears
178. Science Scales Mountains Appears
179. Bonds on the High-Wire Appears
180. Sickening Yet Beautiful Appears
181. New World Science Appears
182. Diamond Heart Absent
183. Stone Sanctuary Appears
184. Fort Medusa Appears
185. Lovely Cleavage Plane Flashback
186. To Each Their Own Blade Absent
187. Cyber Guerilla Absent
188. What I Once Sought to Destroy Absent
189. Our Dr. Stone Appears
190. Science Transcends Life Absent
191. Divine Scream, Down to Earth Mentioned
192. Until We Meet Again Absent
193. Our Stone World Flashback
New Stone World Arc
194. Homo Sapiens, All Alone Absent
195. Treasure Hunter, All Alone Petrified
196. Scientist, All Alone Petrified
197. A Stony Eden and Its Forbidden Fruit Appears
198. Whole New World Fantasy
199. Superalloys Appears
200. Future Engine Appears
Globetrotting Arc
201. Morse Talk Appears
202. Ryusui Corp. Absent
203. Missile Heart Absent
204. The Universe is Written in the Language of Mathematics Absent
205. Universe of Zeroes and Ones Absent
206. Dawn of the Computer Appears
207. Linking the Circuit Diagram Appears
208. Science Transcends Humanity Appears
209. The Rocket's Hard Truth Pictured
210. Not One-Way Absent
211. World Tour for Resources Absent
212. Final Part: Stone to Space Absent
Moon Mission Arc
213. Unknown Known Appears
214. Stone World's Earth Defense Force Pictured
215. Long, Long Road Flashback
216. Hello, World Appears
217. Science Underdogs Appears
218. WWW (World Wide Workshop) Appears
219. Three Heroes Appears
220. A Desire for All Appears
221. Entrusting It All Absent
222. Science Road Appears
223. 0 Appears
224. In Space Flashback
225. Docking Appears
226. Giant Step Appears
227. It Was You Pictured
228. Life Stone Flashback
229. Why-Man Flashback
230. Human Appears
231. A Future To Get Excited About Absent
232. Final Chapter: Dr. STONE Appears


  • Taiju's name is composed of "tai" ( big; large) and "ju" ( tree) to create Taiju (Big Tree), while Ōki is composed of "ō" ( big; large) and "ki" ( tree) to create Ōki (Big Tree).
    • This means that his name is literally "Big Tree, Big Tree."
    • Taiju shares a motif with Senku and Yuzuriha in that his name contains "ju" ( tree) and "ki" ( tree) in his name, which correlates to the theme of "land, sea, and sky."
  • Taiju's head is an 8 on the Mohs scale of mineral hardness, the same level as several gemstones (including cubic zirconia, the 'synthetic diamond').[30]
  • Taiju did not watch television pre-petrification.[31]


  1. 1.0 1.1 1.2 1.3 1.4 Dr. Stone Manga: Chapter 1
  2. Dr. Stone Manga: Volume 22 — Extras
  3. Dr. Stone Manga: Chapter 99, Page 18
  4. 4.0 4.1 Dr. Stone Manga: Chapter 178, Page 18
  5. Dr. Stone Manga: Volume 19 — Extras
  6. Dr. Stone Manga: Chapter 1, Page Taiju Oki is petrified along with all of Earth's human population.
  7. Dr. Stone Manga: Chapter 1, Page Taiju Oki wakens from petrification in the miracle cave.
  8. Dr. Stone Manga: Chapter 103, Page 16, Taiju Oki is petrified along with majority of the Perseus crew.
  9. Dr. Stone Manga: Chapter 118, Page 12 Taiju Oki is revived by Ryusui.
  10. Dr. Stone Manga: Chapter 133, Page 16
  11. Dr. Stone Manga: Chapter 138, Page 3
  12. Dr. Stone Manga: Chapter 192, Page 5, Taiju Oki is petrified along with the rest of the world.
  13. Dr. Stone Manga: Chapter 197, Page 6, Taiju Oki is revived by Senku.
  14. Dr. Stone Manga: Chapter 232
  15. Dr. Stone Manga: Chapter 1, Page 14
  16. Dr. Stone Manga: Chapter 1, Page 41
  17. Dr. Stone Manga: Chapter 141, Page 20 Taiju recreates his scar.
  18. Dr. Stone Manga: Chapter 152, Page 9 Taiju recreates his scar.
  19. Dr. Stone Manga: Chapter 1, Page 1
  20. Dr. Stone Manga: Chapter 1, Pages 19 - 45
  21. 21.0 21.1 Dr. Stone Manga: Chapter 11
  22. 22.0 22.1 22.2 Dr. Stone Manga: Chapter 6
  23. 23.0 23.1 Dr. Stone Manga: Chapter 2
  24. Dr. Stone Manga: Chapter 3
  25. Dr. Stone Manga: Chapter 8
  26. 26.0 26.1 Dr. Stone Manga: Chapter 119
  27. Dr. Stone Manga: Chapter 117
  28. Dr. Stone Manga: Chapter 152, Page 14
  29. Dr. Stone Manga: Chapter 4, Page 8
  30. Dr. Stone Manga: Chapter 28 — Extra
  31. Dr. Stone Manga: Chapter 12 — Q&A

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