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Dr. Stone Wiki

Yo Uei (上井 陽 Uei Yō) is a pre-petrification human and former policeman. Originally a member of the Tsukasa Empire, he faked his death after Chrome's escape to avoid the blame, then eventually joins the Kingdom of Science after the stone wars are over.

As penance, he worked with Yuzuriha to rebuild the statues that were destroyed by Tsukasa. Yo also worked in the farming division under Taiju. However, he is constantly butting heads with Magma due to each other's naivety in their respective worlds.


Yo Icons

Yo is a lean but muscular young man of slightly above-average height with incredibly spiky auburn hair, left to flow wildly behind his head. He has a massive piece of stone covering his right eye. For some inexplicable reason, despite ditching the stone eyepatch several times, it somehow always makes a reappearance. Following his fifth petrification, his hair has been rendered shorter due to pieces breaking off in the process.

He typically wears a short, grey sleeveless yukata that leaves most of his legs exposed. He has a large shoulder pad on his left shoulder and wears a spiked necklace. Like many in Tsukasa's Empire, he goes barefoot, though he does decorate himself with ankle bracelets. When Yuzuriha builds a fashion store, Yo wears a modern outfit.[14]

Prior to the petrification, Yo wore a police officer uniform.



He is first shown as being abrasive, rude, and arrogant, having shown off his skills in front of his subordinates to prove how strong he is. He believes himself to be on the same level as Tsukasa, Hyoga and Ukyo when he is little more than a strong-but-unintelligent, violent thug. He also tends to look down on people, especially the Post-Petrification people. He laughs off Chrome's attempt at escape, believing that he was trying to rub two sticks together to create fire to burn his way out (in reality, Chrome was using a battery, but uses Yo's misconception and belittlement to his advantage by feigning ignorance). In addition, he frequently laughs at the "savages" (stone world humans) for not understanding modern science, such as laughing at Magma for looking down on modern science (Magma is the person he fights with the most). He can be dismissive, believing Senku to have gone nuts in Chapter 96 when he starts building his GPS as he can't understand the science behind it. Despite this, he considers modern humans superior to "savages" and takes every chance he can get in proving this.

He is a coward and, once Chrome managed to escape, is quick to leave the Tsukasa's army for fear of punishment. He goes so far as to feign amnesia to join Senku's Kingdom of Science since it would mean a greater chance of survival. He tries to butter up to them by claiming he would like to "redeem himself" by working for Yuzuriha in repairing the broken statues, though this works against him as it proves to be more work than he wished. He is shown to dislike work, often complaining about having to help Yuzuriha's statue fixing (a rather arduous task) and needlework. He similarly complains about farming, though he can be motivated when the promise of profit or power comes along.

Even in his past, he was shown to often disregard rules, once shooting a suspect while claiming that it was because they were trying to flee, and similarly peeing on a wall while being petrified. He has also admitted to being trigger-happy, shooting people on sight. His abrasive, power-seeking personality also makes him easy to manipulate into doing Senku's and Gen's bidding. He often tries to butter up to his superiors while coveting power, though is mostly harmless due to his lack of intellect. He and Magma get into fights often about the capabilities of the "savages" and the capabilities of "modern people", along with their similar personalities, strength, and desire for power and leadership.

Despite this, he does have at least one or two redeeming qualities. While fleeing, he tells his remaining subordinates to tell Tsukasa that he died and to put all the blame of Chrome's escape on him (though this would have no consequences on Yo himself since he would be thought dead, but also no benefit) implying that he at least somewhat cares about his subordinates. He is even willing to redeem himself by helping Yuzuriha out by rebuilding statues with her.[15] Since allying with Senku, Yo is now a loyal member to the Kingdom of Science and while he still seeks power, Yo has not made any attempts to claim it. Indeed, he is often amazed by Senku's inventions and once stated he wished to meet him before the Petrification event.

Abilities and Skills[]

Physical Abilities[]

Yo is former cop with a penchant for violence. As such, he's had his fair share of combat experience prior to the Petrification event.

  • Police Training: As a former cop, he has training in police combat and is shown to be a somewhat competent combatant with a tonfa. His skill allows him to hold his own in his comical bouts with Magma.
  • Running: After Chrome escaped the jail, Yo assesses the damage to the jail bars before running after Chrome and dodging the pitfall traps. Despite the delay, he still succeeds in catching up to him.[16]
  • Marksmanship: Thanks to his experience as a police officer, Yo was trained in the usage of firearms though due to a lack of practice since he was petrified, he is initially a poor shot though he is able to improve after some target practice[17]. However, his accuracy and skill is still far below Ukyo.
  • Martial Arts: Yo specializes in Tonfa usage in martial arts. Yo is very proficient in using the Tonfa, being able to take out a large muscular man in the Tsukasa Empire in one blow[18].


  • Tonfa: When we are first introduced to Yo, he is seen using his second-favorite weapon, the tonfa, which he uses very proficiently.
  • Gun: When the Kingdom of Science creates a gun during the Treasure Island Arc, they entrust Yo with it as he's the only member of the KOS that has had any practice in firearms. Although not using it well at first, he eventually begins to use it well once more.


3/5 C
4/5 B
5/5 A
1/5 E
Yo's stats, according to Volume 9

Chapter Appearances[]

Chapter Appearances
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 Absent
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 Absent
62. Double Chase Absent
63. Information Warfare Absent
64. Hotline Absent
65. Call From the Dead Absent
66. Liars and Truth Tellers Absent
67. Full Mobilization Absent
68. Flame of Revolution Absent
69. Steam Gorilla Absent
70. Paper Shield Absent
71. Prison Break Debut
72. Experience Points Appears
73. Top-Secret Mission Absent
74. Fateful 20 Seconds Flashback
75. 20-Second Countdown Absent
76. Final Battle Absent
77. The Power of Science Absent
78. That Which Destroys or Saves Absent
79. For This Very Moment Appears
80. Humanity's Strongest Tag Team Appears
81. Fingertip Absent
82. Epilogue of Stone Wars (End of Part 2) Appears
Age of Exploration Arc
83. Dr. Stone Appears
84. People = Power Appears
85. Ultimate Resource Absent
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 Absent
93. The First Shot Is Yours Absent
94. The Scent of Black Gold Appears
95. First Contact Absent
96. Eye of Science Appears
97. The Joy of Leadership Appears
98. Ryusui Appears
99. Kingdom of Science Photo Journal Appears
100. Origin of the 100 Tales Pictured
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 Absent
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 Absent
115. One Second, One Grain Absent
116. Miracle in Hand Absent
117. The Kingdom of Science Strikes Back Petrified
118. Silent Soldiers Absent
119. Science Soldiers Absent
120. Top Secret Absent
121. Medusa's True Face Absent
122. Brain-Battle Puzzle Pieces Absent
123. The Battle of Wits' Deal Game Absent
124. The Invention of God and the Devil Appears
125. The Decisive Three-Dimensional Battle Appears
126. A 3-D Strategy Appears
127. Medusa and Perseus Appears
128. Island-Wide Battle Royale Appears
129. Joker Appears
130. Devil's Choice Absent
131. Nasty Crimes Appears
132. The Strongest Weapon Is... Appears
133. Flash of Destruction Appears
134. Commander Faceoff Absent
135. Counting Absent
136. Medusa Vs. Science Absent
137. Last Man Standing Absent
138. End Of Part 3 Pictured
New America City Arc
139. First Dream Appears
140. New World Plots Absent
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 Appears
147. Science Journey Absent
148. Pioneers of Earth Appears
149. Light Lure in Darkness Appears
150. Righteous Science User Appears
151. Dr. X Absent
152. Doctor Vs. Doctor Appears
153. Science Wars Appears
154. Spy vs. Spy Appears
155. Science Is Elegant Appears
156. Two Scientists Absent
157. Same Time, Same Place Absent
158. Who's the Scientist? Absent
159. Lock On Absent
160. Gunshots Echo Appears
161. Craft Wars Absent
162. Down the Earth-Stained Path Absent
163. Multifront Final Battle Appears
164. Re-Lock On Appears
165. Know the Rules, Make the Rules Pictured
166. Ultimate Knight Pictured
167. Different Strokes Absent
168. Corn City: Population One Million Absent
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 Absent
173. Earth Race Absent
174. The Specter of the Panama Canal Absent
175. Ultra Race Across South America Absent
176. Net-Breaking Battle Plan Absent
177. Medusa Mechanism Appears
178. Science Scales Mountains Pictured
179. Bonds on the High-Wire Absent
180. Sickening Yet Beautiful Absent
181. New World Science Absent
182. Diamond Heart Appears
183. Stone Sanctuary Appears
184. Fort Medusa Absent
185. Lovely Cleavage Plane Appears
186. To Each Their Own Blade Absent
187. Cyber Guerilla Absent
188. What I Once Sought to Destroy Absent
189. Our Dr. Stone Absent
190. Science Transcends Life Appears
191. Divine Scream, Down to Earth Appears
192. Until We Meet Again Absent
193. Our Stone World Absent
Globetrotting Arc
201. Morse Talk Absent
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 Pictured
208. Science Transcends Humanity Appears
209. The Rocket's Hard Truth Appears
210. Not One-Way Appears
211. World Tour for Resources Appears
212. Final Part: Stone to Space Appears
Moon Mission Arc
213. Unknown Known Appears
214. Stone World's Earth Defense Force Appears
215. Long, Long Road Appears
216. Hello, World Appears
217. Science Underdogs Pictured
218. WWW (World Wide Workshop) Pictured
219. Three Heroes Appears
220. A Desire for All Pictured
221. Entrusting It All Absent
222. Science Road Appears
223. 0 Appears
224. In Space Absent
225. Docking Flashback
226. Giant Step Appears
227. It Was You Absent
228. Life Stone Flashback
229. Why-Man Absent
230. Human Flashback
231. A Future To Get Excited About Absent
232. Final Chapter: Dr. STONE Pictured


  • Both parts of Yo Uei's names are used as interjections, "Yo" for when trying to get someone's attention and "Uei" when surprised, though neither are limited to these situations. The character Yo uses both frequently.
  • In the anime, Yo was apparently revived thanks to Minami recognizing him as a "crazy-strong" police officer who won the baton category at a police martial arts competition, who she'd interviewed previously.[19]
    • The anime also shows that Yo has a small crush on Minami.
  • He is the second person to be petrified five times, the first being Ryusui.
  • The Martial Arts that Yo uses is known as Okinawan Martial Arts.
  • While Inagaki doesn't particularly discuss the characters much, he has taken to X[20] a few times to discuss his concern over Yo's awful conduct while he served as a policeman potentially being lost in translation to other sides of the audience.


  1. Dr. Stone Manga: Volume 22 — Extras
  2. 2.0 2.1 Dr. Stone: Kingdom of Science Encyclopedia, Page 94
  3. Dr. Stone Manga: Volume 19 — Extras
  4. Dr. Stone Manga: Chapter 1, Page Yo Uei is petrified along with all of Earth's human population.
  5. Dr. Stone Manga: Chapter 71, Page 2
  6. Dr. Stone Manga: Chapter 103, Page 15, Yo Uei is petrified along with majority of the Perseus Crew.
  7. Dr. Stone Manga: Chapter 124, Page 13, Yo is revived to shoot the gun.
  8. Dr. Stone Manga: Chapter 133, Page 4, Yo Uei is shown to be petrified by Ibara in order to obtain the petrification weapon.
  9. Dr. Stone Manga: Chapter 138, Page 6, Yo Uei is revived along with everyone else on the Perseus.
  10. Dr. Stone Manga: Chapter 191, Page 19, Yo Uei is petrified along with the rest of Corn City.
  11. Dr. Stone Manga: Chapter 206, Page 5, Yo Uei is revived in Corn City.
  12. Dr. Stone Manga: Chapter 213, Page 19
  13. Dr. Stone Manga: Chapter 214, Page 6
  14. Dr. Stone Manga: Chapter 87, Page 18
  15. Dr. Stone Manga: Chapter 82, Page 11
  16. Dr. Stone Manga: Chapter 72, Page 9
  17. Dr. Stone Manga: Chapter 124, Page 18
  18. Dr. Stone Manga: Chapter 71, Page 3
  19. Dr. Stone Anime: Episode 30
  20. https://twitter.com/reach_ina/status/1301692063629471744

Site Navigation[]

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Tsukasa Empire
Male Tsukasa ShishioHyogaUkyo SaionjiYo Uei
Female Homura MomijiMinami HokutozaiNikki Hanada
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Kingdom of Science
Male ChromeGen AsagiriGinroHyogaJoel GearKasekiKinroKokuyoMagmaRyusui NanamiSai NanamiSenku IshigamiTaiju OkiTetsuya KinomotoTsukasa ShishioUkyo SaionjiYo Uei
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Pre-Petrification Humans
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Unknown Francois