Less than ten minutes remaining... can you keep this up? I'm looking for... heroes who rise up and break through in the face of adversity.
Ectoplasm to Fumikage Tokoyami and Tsuyu Asui in "Midoriya's Observations"

Ectoplasm (エクトプラズム Ekutopurazumu?) is a Pro Hero and member of the U.A. High School faculty, who teaches mathematics. 


Ectoplasm is a tall, slender man with short hair, and completely blank eyes, tilted inwards. Due to losing his legs in the line of duty, he uses replacement prosthetics, and when in anything but his hero attire, he wears a pair of large glasses. 

In his hero costume, he wears a tan cloak that covers most of his body, the area over his torso, and the high collar resembling that of a double-breasted trench coat. Underneath this, he wears a skin-tight black bodysuit with a golden striped neck area and a matching black helmet that covers his entire head, a jaw-guard attached over his nose and around his jaw, and circular mufflers. He also wears baggy dark gray pants and a pair of thin, lightweight prosthetic legs.



Ectoplasm is a steadfast and unrelenting hero, which has made him highly popular.[1]

As a teacher, he desires the best from his students and isn't afraid to push them; he openly warned Fumikage Tokoyami and Tsuyu Asui he would do his best to crush them during their final exams. He also told them he was looking for his students to shine under pressure.[2]


In the past, a villain took his legs. He now wears a proper prosthetic when in civilian clothes and sports a special lightweight battle prosthetic while in his costume.


Entrance Exam Arc

Ectoplasm first appears watching the Entrance Exam's practical portion. He is surprised when Izuku Midoriya uses his Quirk to destroy the giant villain bot.[3]

U.S.J. Arc

Ectoplasm finds Denki Kyokya and Momo

Ectoplasm rescues the students.

Ectoplasm is one of the pro heroes who arrive at U.S.J with Tenya Iida as reinforcements. They arrive to Class 1-A under siege by the League of Villains. Ectoplasm uses his Quirk to take down several of the villains and rescues Denki Kaminari, Momo Yaoyorozu, and Kyoka Jiro.[4]

Final Exams Arc

Ectoplasm is present for the faculty meeting where the teachers agree to change the practical portion of the Final Exams. He is placed against Tsuyu and Fumikage to take advantage of the latter’s weakness at close range.[5] He and the other teachers explain the changes to the exam to the students of Class 1-A.[6]

Fumikage and Tsuyu vs Ectoplasm

Ectoplasm puts Fumikage and Tsuyu to the test.

Ectoplasm faces Fumikage and Tsuyu in the second battle inside a large labyrinth type building. Fumikage and Tsuyu start at the center of the structure and Ectoplasm spawns several of his clones around them. He warns them that he and the other teachers will do their best to crush the students. The students manage to flee into the upper levels of the building, but Ectoplasm keeps his clones in hot pursuit.[5]

Although Ectoplasm's clones manage to overwhelm Fumikage a few times, Tsuyu's support allows them to destroy twenty-eight of them. The students reach the vicinity of the escape gate where the real Ectoplasm is waiting. He compliments the tandem for defeating his clones but asks them if they can deal with his next attack. Ectoplasm uses Forced Internment Giant Bites, a move that creates a giant clone of himself and traps the students inside it.

Immobilized, Fumikage orders Dark Shadow to escape in a last-ditch effort. Ectoplasm intercepts it and attacks with a flurry of kicks. Dark Shadow is unable to get past Ectoplasm with hand to hand combat and shortly retreats. They clash one final time, and Dark Shadow manages to handcuff Ectoplasm in a sneak attack. Tsuyu swallowed the handcuffs beforehand and gave them to Dark Shadow during its retreat. Having passed the exam, Ectoplasm releases the students from the giant clone and commends them on their clever synergy.[7][2]

Provisional Hero License Exam Arc

Ectoplasm, Midnight, and Cementoss join Shota Aizawa in his homeroom class to announce that Class 1-A needs to develop super moves. [8] They move to Gym Gamma, where Ectoplasm creates twenty clones for each student to fight in order to further develop their quirks and eventually create special techniques. This training is meant to prepare the students for the upcoming Provisional Hero License Exam. Ectoplasm uses Tenya's Reciproburst as an example of a Super Move

Ectoplasm vs Mashirao Ojiro

Ectoplasm trains the students for the Provisional Hero License Exam.

Ectoplasm easily defeats Mashirao Ojiro during a sparring match. He tells Mashirao he moves predictably and they need to work on his fighting fundamentals. Mina Ashido tries further the range of her acid attacks and Ectoplasm advises her to do so by forming her hands in the shape of a nozzle. Ectoplasm challenges Momo to create two things at once with her Quirk, and she does so with ease. Katsuki Bakugo excells during the training and even manages to destroy one of Ectoplasm's clones before demanding he make another.

Ectoplasm catches Izuku Midoriya staring off into space and hits him. Izuku explains he's struggling to develop a technique because of the injuries to his arms. Ectoplasm agrees that Izuku's Quirk is too inconsistent and if he doesn't have a fixed fighting style than he needs to focus on developing it for the day. Ectoplasm also supervises Rikido Sato as he eats sweets and tells Ochaco Uraraka to focus while levitating herself. [9]

U.A. School Festival Arc

For the U.A. School Festival, Ectoplasm and Hound Dog are put in charge of security.[10] As Izuku and Gentle Criminal battle, Hound Dog and several clones of Ectoplasm have caught a whiff of Izuku and Gentle’s battle. Hound Dog and the Ectoplasm clones have reached Gentle and La Brava, as Gentle declares his surrender.[11]

Quirk and Abilities

Overall Abilities: Ectoplasm is a more than capable Pro-Hero and is among the strongest of the U.A. Faculty members. He excels at close range combat despite not having his legs anymore. Thanks to combat prosthetics, Ectoplasm's fighting style consists mostly of kicks in close range combat. This is why he was chosen to face Fumikage during the First Term Final Exam's practical portion. His close-range combat abilities exposed Fumikage's weaknesses and Ectoplasm easily overpowered Dark Shadow in combat. Ectoplasm is also very intelligent and has the ability to analyze Quirks in order to help students improve them.

Mathematics skill: As a high school math teacher, it is implied that he is at least somewhat skilled in the subject of math.



Ectoplasm's clones

Clones (分身 Bunshin?): Ectoplasm's Quirk gives him the ability to produce streams of ectoplasm from his mouth and transform it into clones of himself. He can create as many as thirty clones at once, though, it is possible for him to push his limit to thirty-six on a good day. He can also produce a single giant clone of himself, although this sacrifices his ability to produce normal sized ones for the time being. His clones can be defeated with a strong blow, but otherwise, only Ectoplasm can dispel them.[2]

Super Moves

  • Forced Internment Giant Bites (強制収容ジャイアントバイツ Kyōsei Shūyō Jaianto Baitsu?): Ectoplasm shoots ectoplasm from his mouth and transforms it into a giant clone of himself. The giant Ectoplasm clone then overwhelms and traps the enemy with a huge bite. He first used this during final exams.[7][2]


4/5 B
4/5 B
5/5 A
3/5 C
2/5 D
Ectoplasm's stats, according to the Ultra Archive Book

4/6 B
3/6 C
5/6 A
3/6 C
5/6 A
Ectoplasm's stats, according to the Ultra Analysis Book


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

Prosthetic Legs: After a villain robbed Ectoplasm's legs, Ectoplasm wears prosthetic legs. In his hero costume, he switches to a lighter pair of prosthetic legs.

Battles & Events

Battles & Events

Chapter Appearances

U.S.J. Arc
12. Yeah, Just Do Your Best, Iida! 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
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 Appears
67. Stripping the Varnish Absent
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. Result's 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
U.A. School Festival Arc
169. School Festival Absent
170. With Eri Absent
171. Gentle and La Brava Absent
172. Prepping for the School Festival Is the Funnest Part (Part 1) Absent
173. Prepping for the School Festival Is the Funnest Part (Part 2) Absent
174. Golden Tips Imperial Absent
175. Morning, the Day Of Absent
176. Deku vs. Gentle Criminal Absent
177. At the Construction Site Absent
178. The Woman Called La Brava Absent
179. School Festival Start!! Absent
180. Unbeknownst Appears
181. For Someone Else Appears
182. Let It Flow! School Festival! Appears
183. Festival All Day Long!! Appears
Joint Training Arc
194. Cold Skies Over U.A. High! Absent
195. Clash! Class A vs. Class B! Absent
196. Make It Happen, Shinso!! Absent
197. Quaotic Quirkstravaganza Absent
198. Known Where You Stand When It Counts!! Absent
199. Operation New Improv Moves! Absent
200. Clever Commander! Absent
201. Foresight Absent
202. Match 3 Absent
203. Flexible! Juzo Honenuki! Absent
204. Tuning Up Absent
205. Detour Absent
206. Match 3 Conclusion Absent
207. Early Bird! Absent
208. Match 4 Conclusion Absent
209. Match 5 Start Absent
210. The One For All Dream Absent
211. That Which Is Inherited Absent
212. That Which Is Inherited, Part 2 Absent
213. Realm of Souls Absent
214. Our Brawl Absent
215. Final Face-Off! Midoriya vs. Shinso! Absent
216. Class A vs. Class B: Conclusion Absent
217. The New Power and All For One Appears
Endeavor Agency Arc
241. Do That Interview! Absent
242. Have a Merry Christmas! Appears
243. Off to Endeavor's Agency! Absent
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. You Could Be 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 Appears
259. A Quiet Beginning Absent
260. Life's Work Appears
261. High-Ends Absent
262. Mirko, the No. 5 Hero Absent
263. I Wanna Be With You Guys!! Absent
264. One's Justice Absent
265. Villains and Heroes Absent
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 Absent
274. Search Absent
275. Encounter, Part 2 Absent
276. You Cheated...! Absent


  • Ectoplasm likes karaoke.
  • Withouth his mask, it's seen that he has a full denture over the skin, similar to Juzo Honenuki.
  • His Japanese voice actor, Masakazu Nishida, also voices Mezo Shoji, and his English voice actor, Mike McFarland, also voices Mashirao Ojiro.[2]
  • Ectoplasm's appearance may have been based on the appearance of Guy-Manuel de Homem-Christo of Daft Punk. The helmets are both golden, with the face, sides, and top of head being receded and solid black.
    • Although Guy-Manuel de Homem-Christo's helmet only sometimes has a face, and when there is one its electronic.


  • (To Fumikage Tokoyami and Tsuyu Asui) "Less than ten minutes remaining...can you keep this up? I'm looking for...heroes who rise up and break through in the face of adversity."[7]


  1. My Hero Academia Manga: Vol. 7, Omake
  2. 2.0 2.1 2.2 2.3 2.4 My Hero Academia Anime: Episode 35.
  3. My Hero Academia Anime: Episode 4.
  4. My Hero Academia Anime: Episode 13.
  5. 5.0 5.1 My Hero Academia Manga: Chapter 61.
  6. My Hero Academia Anime: Episode 34.
  7. 7.0 7.1 7.2 My Hero Academia Manga: Chapter 66.
  8. My Hero Academia Manga and Anime: Chapter 99 and Episode 52.
  9. My Hero Academia Manga and Anime: Chapter 100 and Episode 52.
  10. My Hero Academia Manga: Chapter 174 (p. 14).
  11. My Hero Academia Manga: Chapter 180.

Site Navigation

*Disclosure: Some of the links above are affiliate links, meaning, at no additional cost to you, Fandom will earn a commission if you click through and make a purchase. Community content is available under CC-BY-SA unless otherwise noted.

Fandom may earn an affiliate commission on sales made from links on this page.

Stream the best stories.

Fandom may earn an affiliate commission on sales made from links on this page.

Get Disney+