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Overview
Gallery
Synopsis
Listen. When it comes to fighting... it's all about making use of your particular strengths.
Ken Ishiyama to Eijiro Kirishima and Rikido Sato in "Stripping the Varnish"

This article is about the U.A. High teacher. For the Pro Hero known as Rock Lock, see Ken Takagi.

Ken Ishiyama ( (いし) (やま) (けん) Ishiyama Ken?), also known by his hero name Cementoss (セメントス Sementosu?), is a Pro Hero and member of the U.A. High School faculty where he teaches Modern Literature.

Appearance

Cementoss appears to be a humanoid block of cement with black, seemingly shut eyes and gray hair tied into a short ponytail. His body shape is evenly blocky all around his body. His eyes are generally closed (but tiny when opened) and his lips are pulled upwards. His hero costume consists of a sleeveless brown suit that includes yellow stripes, shorts, and an elongated collar. He also sports gray shoes with yellow soles.

Gallery

Personality

Cementoss is an often serious yet pleasant individual. He is very careful of the well being of others. He did not allow Eijiro Kirishima to compromise All Might's identity [1] and also wanted to stop the match between Izuku Midoriya and Shoto Todoroki, noting that Izuku's injuries were serious enough to stop the bout.[2]

Abilities

Modern Literature Expertise: Ken teaches high school modern literature. This suggests that he is well versed in the subject.

Quirk

Cement (セメント Semento?): Ken's Quirk allows him to manipulate any cement-based material that he touches, allowing him to deform the object into various shapes and sizes, changing its appearance. His Quirk doesn't appear to have a time limit, and Recovery Girl mentioned his Quirk is among the most difficult of the U.A. teachers to fight against.[3]

Ken is shown to have a superior handle over his Quirk, what with him being a Pro Hero and U.A. teacher. He continuously is seen creating multiple, towering vertical slabs by touching the concrete ground with his hands. The slabs are seen to be able to withstand a considerate amount of damage, shown when Rikido Sato and Eijiro Kirishima had a hard time overcoming his ongoing walls during the exam.

Stats

Power
 
3/5 C
Speed
 
2/5 D
Technique
 
5/5 A
Intelligence
 
5/5 A
Cooperativeness
 
4/5 B
Ken's stats, according to the Ultra Archive Book

Power
 
4/6 B+
Speed
 
5/6 A
Technique
 
5/6 A
Intelligence
 
5/6 A
Roundness
 
1/6 E
Ken's stats, according to the Ultra Analysis Book

Equipment

High Density Weights (Final Exams Arc): Cementoss and the rest of the teachers use these bracelets to give themselves a handicap while they are fighting their students.

Battles & Events

Battles & Events


Relationships

Toshinori Yagi

Cementoss considers himself a big fan of All Might despite the fact that he is also a Pro Hero. Like the rest of the professors at the U.A. He knows his secret identity and he does his best to prevent others from discovering it. He also knows about All Might's stomach wound and how this limits his ability to use his Quirk, so Cementoss cares about his health and advises him not to overdo it when he performs his duties as a hero.[4]

Chapter Appearances

Appearances
U.S.J. Arc
12. Yeah, Just Do Your Best, Ida! Absent
13. Rescue Training Absent
14. Encounter with the Unknown Absent
15. Vs. Absent
16. Know Your Enemies Absent
17. Game Over Absent
18. Heroes' Counterattack Absent
19. All Might Absent
20. The World of Pros Debut
21. In Each of Our Hearts Appears
U.A. Sports Festival Arc
22. That's the Idea, Ochaco Appears
23. Roaring Sports Festival Absent
24. Mad Dash and Knockdown Absent
25. In Their Own Quirky Ways Appears
26. Chase Down the Leader Absent
27. Earth-Shatteringly Fateful Negotiations Appears
28. Strats, Strats, Strats Absent
29. Unaware Absent
30. Cavalry-Match Finale Absent
31. The Boy Born with Everything Absent
32. Smile, Prince of Nonsense Land! Appears
33. Shinso's Situation Absent
34. Victory or Defeat Absent
35. Battle On, Challengers! Absent
36. Bakugo vs. Uraraka Appears
37. Midoriya and Endeavor Appears
38. Todoroki vs. Midoriya Absent
39. Shoto Todoroki: Origin Appears
40. Emancipation Appears
41. Fight On, Ida Absent
42. Final-Match Time Absent
43. Todoroki vs. Bakugo Absent
44. Relaxing Day Off Absent
Vs. Hero Killer Arc
45. Time to Pick Some Names Appears
46. Bizarre! Gran Torino Appears Absent
47. Struggling Absent
48. Getting the Knack Absent
49. Midoriya and Shigaraki Absent
50. Kill 'Em Dead Absent
51. No, Knock It Off, Ida Absent
52. Hero Killer Stain vs. U.A. Students Absent
53. From Todoroki to Ida Absent
54. Re: Ingenium Absent
55. Conclusion?! Absent
56. Conclusion Absent
57. The Aftermath of Hero Killer Stain Absent
58. Internship's End Absent
59. Listen Up!! A Tale from the Past Absent
Final Exams Arc
60. Gear Up for Final Exams Appears
61. The Worst Combo Appears
62. Katsuki Bakugo: Origin Absent
63. Yaoyorozu Rising Absent
64. The Task at Hand Absent
65. Wall Absent
66. Midoriya's Observations Absent
67. Stripping the Varnish Appears
68. Encounter Absent
69. Interview with Midoriya Absent
Provisional Hero License Exam Arc
98. Moving into Dorms Absent
99. Goodbye Two-Digit Chapters, Hello Three Digits Appears
100. Creating Ultimate Moves Appears
101. The Girl Called Mei Hatsume Absent
102. On Cloud Nine Appears
103. The Test Absent
104. White-Hot Battle! To Each Their Own Strengths! Absent
105. Shiketsu High Lurking Absent
106. Class 1-A Absent
107. Denki Kaminari's Thoughts Absent
108. RUSH! Absent
109. Rescue Exercise Absent
110. Rescue Exercise Continued Absent
111. Smoldering Start Absent
112. What's the Big Idea? Absent
113. Test's Aftermath Absent
114. Results' Aftermath Absent
115. Unleashed Absent
116. Meeting in Tartarus Absent
117. A Talk About Your Quirk Absent
118. Meaningless Battle Absent
119. Deku vs. Kacchan, Part 2 Absent
120. The Three Absent
121. Second Semester Opening Ceremony Absent
Shie Hassaikai Arc
122. A Season for Encounters Absent
123. Unrivaled Absent
124. Trouble Ahead!! Episode: Work Studies Absent
125. Overhaul Absent
126. Open Up, World Appears
127. Sir Nighteye and Izuku Midoriya and Mirio Togata and All Might Absent
128. Boy Meets... Absent
129. Eri Absent
130. Listen to the Truth Appears
131. Fighting Fate Absent
132. The Plan Absent
133. Catch Up, Kirishima Absent
134. Let's Go, Gutsy Red Riot Absent
135. An Unpleasant Talk Absent
136. Close at Hand!! Absent
137. Restraint!! Absent
138. Go!! Absent
139. Shudder! The Underground Labyrinth Absent
140. Suneater of the Big Three Absent
141. Hassaikai: Behind the Scenes Absent
142. Shield and Shield, Spear and Shield Absent
143. Let’s Rumble, Rappa!! Absent
144. Red Riot, Part 1 Absent
145. Red Riot, Part 2 Absent
146. Temp Squad Absent
147. Twoga!! Absent
148. The Anguish of Young Twoga Absent
149. Don't Get Mad, Irinaka Absent
150. Mirio Togata Absent
151. Mirio Togata!! Absent
152. Lemillion Absent
153. Transform! Absent
154. Unforeseen Hope Absent
155. Saviors, the Saved and a Hero's Place Absent
156. The Power of Those Saved Absent
157. Infinite 100 Percent Absent
158. Chisaki's Warped Compassion Absent
159. It's Over!! Absent
160. Expressway Absent
161. Bright Future Absent
162. Suitable One Absent
Remedial Course Arc
163. Smoldering Flames Absent
164. Masegaki Absent
165. Win Those Kids' Hearts Absent
166. Be Proud, License Trainees Absent
167. Number One Hero's Starting Line Absent
168. The Strange Tale of Aoyama Appears
Endeavor Agency Arc
241. Do That Interview! Absent
242. Have a Merry Christmas! Appears
243. Off to Endeavor's Agency! Appears
244. Recommended Reading Absent
245. Rise to Action Absent
246. Message Absent
247. Status Report! Absent
248. One Thing at a Time Absent
249. The Hellish Todoroki Family Absent
250. Ending Absent
251. Just One Week Absent
252. The Unforgiven Absent
Paranormal Liberation War Arc
253. Shirakumo Absent
254. More of a Hero than Anyone Absent
255. Hero Hopeful Absent
256. The High, Deep Blue Sky Absent
257. Pass It Forward, to Whomever Absent
258. Friends Absent
259. A Quiet Beginning Appears
260. Life's Work Absent
261. High-Ends Absent
262. Mirko, the No. 5 Hero Absent
263. I Wanna Be with You Guys!! Appears
264. One's Justice Appears
265. Villains and Heroes Mentioned
266. Happy Life Absent
267. Flames Absent
268. Scramble! Absent
269. The Three of Us Absent
270. Inheritance Absent
271. Dark Cloud Absent
272. Good Morning! Absent
273. The Thrill of Destruction Appears
274. Search Absent
275. Encounter, Part 2 Absent
276. You Cheated...! Absent
277. Who...? Absent
278. Disaster Walker Appears
279. League of Villains vs. U.A. Students Absent
280. Red Riot, Part 3 Absent
281. Plus Ultra Absent
282. Footfall of Destruction Absent
283. 75 Absent
284. Deep Blue Battle Absent
285. Katsuki Bakugo Rising Absent
286. The Ones Within Us Absent
287. Mistake Absent
288. Save Takeo!! Absent
289. Miss Candid and Miss Shut-Away Absent
290. Dabi's Dance Absent
291. Thanks For Going Strong Absent
292. Threads of Hope Absent
293. Hero-Saturated Society Absent
294. Final Performance Absent
295. Tenacious Absent
296. Hellish Hell Appears
297. Tartarus Absent
298. Sounds of Collapse Absent
299. Like Those Tragic Tales Absent
300. The Hellish Todoroki Family, Part 2 Absent
301. The Wrong Way to Put Out a Fire, Part 1 Absent
302. The Wrong Way to Put Out a Fire, Part 2 Absent
303. Top Three Absent
304. Izuku Midoriya and Toshinori Yagi Absent
305. Izuku Midoriya and Tomura Shigaraki Absent
306. The Final Act Begins Absent

Anime Appearances

Appearances
Season 1
1. Izuku Midoriya: Origin Absent
2. What It Takes to Be a Hero Absent
3. Roaring Muscles Absent
4. Start Line Debut
5. What I Can Do for Now Absent
6. Rage, You Damn Nerd Absent
7. Deku vs. Kacchan Absent
8. Bakugo's Start Line Absent
9. Yeah, Just Do Your Best, Ida! Absent
10. Encounter with the Unknown Absent
11. Game Over Absent
12. All Might Absent
13. In Each of Our Hearts Appears
Season 2
14. That's the Idea, Ochaco Appears
15. Roaring Sports Festival Absent
16. In Their Own Quirky Ways Absent
17. Strategy, Strategy, Strategy Absent
18. Cavalry Battle Finale Absent
19. The Boy Born with Everything Appears
20. Victory or Defeat Appears
21. Battle on, Challengers! Appears
22. Bakugo vs. Uraraka Appears
23. Shoto Todoroki: Origin Appears
24. Fight on, Ida Absent
25. Todoroki vs. Bakugo Absent
26. Time to Pick Some Names Appears
27. Bizarre! Gran Torino Appears Absent
28. Midoriya and Shigaraki Absent
29. Hero Killer: Stain vs U.A. Students Absent
30. Climax Absent
31. The Aftermath of Hero Killer: Stain Appears
32. Everyone's Internships Absent
33. Listen Up!! A Tale from the Past Absent
34. Gear up for Final Exams Appears
35. Yaoyorozu: Rising Absent
36. Stripping the Varnish Mentioned
37. Katsuki Bakugo: Origin Absent
38. Encounter Absent
Season 3
39. Game Start Absent
40. Wild, Wild Pussycats Absent
41. Kota Absent
42. My Hero Absent
43. Drive It Home, Iron Fist!!! Absent
44. Roaring Upheaval Absent
45. What a Twist! Absent
46. From Ida to Midoriya Absent
47. All For One Absent
48. Symbol of Peace Absent
49. One For All Absent
50. End of the Beginning, Beginning of the End Absent
51. Moving into Dorms Absent
52. Create Those Ultimate Moves Appears
53. The Test Absent
54. Shiketsu High Lurking Absent
55. Class 1-A Absent
56. RUSH! Absent
57. Rescue Exercises Absent
58. Special Episode: Save the World with Love! Appears
59. What's the Big Idea? Absent
60. A Talk about Your Quirk Absent
61. Deku vs. Kacchan, Part 2 Absent
62. A Season for Encounters Appears
63. Unrivaled Absent
Season 4
64. The Scoop on U.A. Class 1-A Pictured
65. Overhaul Appears
66. Boy Meets... Absent
67. Fighting Fate Appears
68. Let's Go, Gutsy Red Riot Absent
69. An Unpleasant Talk Absent
70. GO!! Absent
71. Suneater of the Big Three Absent
72. Red Riot Absent
73. Temp Squad Absent
74. Lemillion Absent
75. Unforeseen Hope Absent
76. Infinite 100% Fantasy
77. Bright Future Absent
78. Smoldering Flames Absent
79. Win Those Kids' Hearts Absent
80. Relief for License Trainees Appears
81. School Festival Absent
82. Prepping for the School Festival Is the Funnest Part Absent
83. Gold Tips Imperial Absent
84. Deku vs. Gentle Criminal Absent
85. School Festival Start!! Absent
86. Let It Flow! School Festival! Absent
87. Japanese Hero Billboard Chart Absent
88. His Start Absent
Season 5
89. All Hands on Deck! Class 1-A Absent
90. Vestiges Absent
91. Clash! Class A vs. Class B! Absent
92. Make It Happen, Shinso! Absent
93. Operation New Improv Moves Absent
94. Foresight Absent
95. Match 3 Absent
96. Match 3 Conclusion Absent
97. Early Bird! Absent
98. That Which Is Inherited Absent
99. Our Brawl Absent
100. The New Power and All For One Absent
101. Have a Merry Christmas! Appears
102. Off to Endeavor's Agency! Appears
103. One Thing at a Time Absent
104. Long Time No See, Selkie Absent
105. The Hellish Todoroki Family Absent

Trivia

  • Ken's surname contains the kanji for "stone" ( ishi?) and "mountain" ( yama?), and his first name contains "stiff, firm, hard" ( ken?).
    • "Cementoss" is possibly a combination of "cement" and "toss".
  • According to Volume 4:
    • He's a big fan of All Might.
    • He likes round things (whilst being, ironically, blocky).
    • His favorite food is manju.
    • On his profile in Volume 4, the author commented that he should have given Ken's hair a crew cut.
  • Cementoss shares his first name with Ken Takagi, the "Pro Hero: Rock Lock".
  • He shares the same Japanese voice actor with Masaki Mizushima, otherwise known as "Normal Hero: Manual".

Quotes

  • (To Eijiro Kirishima and Rikido Sato) "Listen. When it comes to fighting... It's all about making use of your particular strengths."[5]
  • "Whatever happens...we must stake our lives on the job!" [6]

References

  1. My Hero Academia Anime: Episode 13.
  2. My Hero Academia Anime: Episode 23.
  3. My Hero Academia Anime: Episode 36.
  4. My Hero Academia Manga and Anime: Chapter 21 and Episode 13.
  5. My Hero Academia Manga: Chapter 67 (p. 2).
  6. My Hero Academia Manga: Chapter 278.

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