I'll have to beat this lesson into you. Acting with class befitting one's institution... that is the meaning of dignity.
Seiji Shishikura to Katsuki Bakugo and Denki Kaminari in "Denki Kaminari's Thoughts"

Seiji Shishikura ( (しし) (くら) (せい) () Shishikura Seiji?), also known as Sisicross (シシクロス Shishikurosu?),[1] is a second-year student at Shiketsu High School training to become a Pro Hero.


Seiji is a young man of fairly average height with thin, slanted eyes and a straight purple fringe, parted on his right so it covers his left eye. Around the back of his head, his hair is fluffier, sticking out in small tufts. 

In his school uniform, Seiji wears the same white collared shirt and dark pants as all Shiketsu High students. He also sports Shiketsu's signature hat whether he be in uniform or in his hero costume. 

His hero costume consists of a black overcoat with red trimmings. Its collar covers his entire neck, only stopping just below his mouth, and two red-rimmed flaps are folded over the top. The sleeves of his coat reach down to his elbows, cut off by two large red cuffs which are strapped onto the upper part of the sleeves, and on his right, he wears a smaller white armband with a black stripe through the middle. On top of his coat, he wears a black apron that reaches down past his knees, plain apart from the red strings threaded twice through that go around his neck. He also wears a peculiar set of gloves that only cover his thumb, index and middle fingers, and black boots. 



Seiji is a proud and dignified individual who values Shiketsu's teachings about obligation and dignity above all else. He often stands with his arms behind his back and uses eloquent language when speaking, which causes people to refer to him as "Senpai".

Seiji believes all heroes should be dignified and vulgar individuals are unworthy of becoming heroes. He believes this so strongly that he prioritized incapacitating unworthy students during the hero licensing exam over actually trying to pass the exam himself.

Seiji refusing to admit he's been influenced by Stain.

Seiji has a lot of respect for U.A. High but believes that the students of Class 1-A sully its image because they lack dignity. He dislikes Katsuki Bakugo especially and lectured him several times during their fight about how Katsuki needs to reflect on how he represents U.A. with his actions.[2] He is also quite obviously insecure about his small eyes. When Katsuki teased him about it, he got angry and said his eyes were big and handsome.[3]

Seiji considers himself to be worthy of being a hero and often fails to see his own faults and has trouble reflecting on his own actions. He has clearly been influenced by Stain to reform the hero position, but he refuses to admit being influenced by a villain. A Shiketsu teacher and Nagamasa Mora believe Seiji has a tendency of imposing his value on others and has been impacted negatively by the Hero Killer. This shortcoming is what ultimately caused Seiji to fail the hero licensing exam. Even so, Seiji remained mostly unfazed and still refused to reflect on himself.[4]


Seiji easily overpowers Eijiro Kirishima and transforms him into a ball of flesh.

Overall Abilities: Seiji is a very formidable combatant, showcased by his position at Shiketsu High and his ability to fight on par with Katsuki Bakugo, Eijiro Kirishima, and Denki Kaminari all at once. Seiji has the respect of his fellow students, all of whom are students at the prestigious Shiketsu, which is believed to be the best school in eastern Japan.

Seiji was not only capable of singlehandedly defeating several students at the Provisional Hero License Exam, but he was able to outwit and overpower Katsuki and Eijiro, two of Class 1-A’s most formidable students, prior to the pair being rescued by Denki. It took the combined efforts of three U.A. students to bring Seiji down.


Meatball ( (せい) (にく) Seiniku?): Seiji's Quirk gives him the ability to manipulate raw flesh. He can knead other people's bodies into disfigured balls of flesh, leaving them incapacitated. His own flesh is more versatile; it can be detached, expanded, and remotely controlled for offensive and defensive purposes.


2/6 D
3/6 C
5/6 A
3/6 C
Using Difficult Words
5/6 A
Seiji's stats, according to the Ultra Analysis Book

Battles & Events

Battles & Events

Chapter Appearances

Provisional Hero License Exam Arc
98. Moving into Dorms Absent
99. Goodbye Two-Digit Chapters, Hello Three Digits Absent
100. Creating Ultimate Moves Absent
101. The Girl Called Mei Hatsume Absent
102. On Cloud Nine Debut
103. The Test Absent
104. White-Hot Battle! To Each Their Own Strengths! Fantasy
105. Shiketsu High Lurking Absent
106. Class 1-A Appears
107. Denki Kaminari's Thoughts Appears
108. RUSH! Mentioned
109. Rescue Exercise Mentioned
110. Rescue Exercise Continued Appears
111. Smoldering Start Absent
112. What's the Big Idea? Absent
113. Test's Aftermath Appears
114. Result's Aftermath Mentioned
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
Remedial Course Arc
163. Smoldering Flames Appears
164. Masegaki Appears
165. Win Those Kids' Hearts Appears
166. Be Proud, License Trainees Appears
167. Number One Hero's Starting Line Appears
168. The Strange Tale of Aoyama Absent
Endeavor Agency Arc
241. Do That Interview! Absent
242. Have a Merry Christmas! Absent
243. Off to Endeavor's Agency! Absent
244. Recommended Reading Absent
245. Rise to Action Absent
246. Message Appears
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


  • Seiji's surname contains the kanji for "flesh" ( shishi?) and "storehouse" ( kura?), and his first name contains "refined" ( sei?) and "child" ( ji?).
  • Seiji's father is employed at Tartarus. The usage of commissar caps by the Tartarus' guards was a deciding factor for Seiji to enroll at Shiketsu High School, since they provided similar fashion to their students.[1]


  • (To Katsuki Bakugo and Denki Kaminari) "I'll have to beat this lesson into you. Acting with class befitting one's institution... that is the meaning of dignity."[5]


  1. 1.0 1.1 1.2 1.3 My Hero Academia: Ultra Analysis: The Official Character Guide.
  2. My Hero Academia Manga and Anime: Chapter 107 and Episode 56.
  3. My Hero Academia Manga and Anime: Chapter 106 and Episode 55.
  4. My Hero Academia Manga and Anime: Chapter 110 and Episode 57.
  5. My Hero Academia Manga: Chapter 107 (p. 2).

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