Kousei Tsuburaba (円場硬成 Tsuburaba Kōsei?) is a student in Class 1-B at U.A..


Kousei has short spiky hair and large oval eyes.



Sports Festival Arc

He teams up with Neito Monoma, along with 2 other Class B students. When Katsuki Bakugou attacks from above, Neito warns him about the danger, causing Kousei to create a solidified air wall, which stops Katsuki. However, Katsuki breaks the wall and grabs two of Neito's headbands.[1]

School Trip Arc

On the day of the forest lodge trip, when Neito Monoma mocks Class 1-A, Kousei is seen observing.[2]

When Class 1-B arrives at the training camp. Homeroom teacher Blood King explains they'll be extending their quirks and the more they use their quirks the stronger they'll be by breaking their limits. When Class 1-B witness Class 1-A's training. Afterwards Itsuka Kendou asks Shouta Aizawa if can they observe everyone, he explains that's the reason The Pussy-Cats are around.[3]

Quirk and Abilities

Solid Air (空気凝固 Kūkigyōko): Kousei's Quirk allows him to solidify air to form a wall or platform. The size of the wall or platform depends on his lung capacity. However, It seems that these walls and platforms are not strong, as Katsuki was able to break a wall as if it was made out of glass using only his bare fist. It didn't look like his fist was injured in the slightest.


Sports Festival Arc

Team Bakugou vs. Team Monoma: Loss


Neito Monoma

Kousei joined Neito's team during the Calvary battle.


  • His name is formed by 円 ("circle"?), 場 ("place"?), 硬 ("hardness"?), and 成 ("formation"?).



  1. Boku no Hero Academia Manga: Chapter 30
  2. Boku no Hero Academia Manga: Chapter 70
  3. Boku no Hero Academia Manga: Chapter 72

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