World War Series Wiki

Shiro (real name Kotaro Yanagisawa) is a mysterious man and former caretaker of Itona Horibe. He is a recurring antagonist to Class 3-E in the first half of the series, but later serves as the final antagonist.


  • Name: Shiro, Kotaro Yanagisawa
  • Origin: Assassination Classroom
  • Gender: Male
  • Age: 34
  • Birthday: December 10
  • Star Sign: Sagittarius
  • Classification: Superhuman Scientist
  • Height: 172 cm (5'8")
  • Weight: 60 kg (133 lbs)
  • Skin Color: Pale
  • Eye Color: Teal
  • Hair Color: Green
  • Relatives:
  • Alignment: Bad
  • Status: Disabled
  • ClassS-ClassSS-Class with Tentacle Cells.
  • Powers and Abilities:
  • Standard Equipment:
  • Weaknesses:
  • Notable Attacks/Techniques:
  • Voice Actor: Ryōta Takeuchi (Shiro), Mitsuaki Madono (Yanagisawa)

Power Stats

  • Attack PotencyStreet level | At least Building level, likely Multi-City Block level
  • Speed: Subsonic with Supersonic Combat and Reaction Speed | Hypersonic+ Combat and Reaction Speed
  • Lifting Strength: Peak Human | Class 10
  • Striking Strength: Class KJ | At least Class MJ, likely Class GJ+
  • Durability: Street level | At least Building level, likely Multi-City Block level
  • Range: Standard Melee Range. Tens of Meters with Energy Attacks
  • Intelligence: Extraordinary Genius (Created an anti-matter being and manipulated Itona Horibe)
  • Fighting Ability: Expert
  • KeyBase | With Tentacle Cells


Shiro wears white robes and a mask over his face, all made from anti-sensei fibers. His actual appearance was unknown until he removed his mask, he is revealed to have short, wavy green hair and teal eyes with his left eye being a prosthetic eye, and fair skin.


During his first appearance, he seems funny and easygoing, and although he retains this attitude while he and Itona attack Korosensei, it soon becomes clear that he is conniving, manipulative, and ruthless in his ambitions. Furthermore, he sees practically everyone other than himself as disposable. In his past as a researcher, he was revealed to be quite umempathetic; he was willing to use human guinea pigs for his research and took out his anger on his coworkers and subordinates, including his fiancee Aguri Yukimura, for getting in the way of his research. Because of his personality, Koro-sensei exploited it twice for his advantage before he was completely defeated as he was abandoned by many country leaders after his defeat in the final battle between Yanagisawa, God of Death and Koro-sensei. It is also implied that he sought perfection for his research while he did not see one's true potential such as Nagisa, who never gains his attention, instead focusing on Akari Yukimura which ultimately he didn't realize that she was easily defeated by Nagisa.



Main Skills and Equipment

Genius Intellect:


Battles & Events