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Kosei Tsuburaba

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


Kosei has short spiky hair and large oval eyes.


Tusburaba seems to have a somewhat snarky personality since he joined Monoma in his teasing towards Bakugou during the Cavalry Battle.


Sports Festival ArcEdit

Kosei comes in 23th place during the Obstacle Course.[1] He teams up with Neito Monoma, along with 2 other Class B students, Shihai Kuroiro and Sen Kaibara. When Katsuki Bakugo attacks from above, Neito warns him about the danger, causing Kosei to create a solidified air wall, which stops Katsuki. However, Katsuki breaks the wall and grabs two of Neito's headbands.[2]

School Trip ArcEdit

On the day of the forest lodge trip, when Neito Monoma mocks Class 1-A, Kosei is seen observing.[3]

When Class 1-B arrives at the training camp. Homeroom teacher Sekijirou Kan explains that they will be extending their Quirks and that the more they use their Quirks, the stronger they will be by breaking their limits. After Class 1-B witnesses Class 1-A's training, Itsuka Kendo asks Shota Aizawa if can they observe everyone, he explains that is the reason The Pussycats are around.[4]

After the Vanguard Action Squad start their attack, Kosei is one of the first students to be affected by Mustard's Sleep Gas, being carried by Todoroki all the time while he and Bakugo are fighting Moonfish, and chasing Mr. Compress afterward.

Quirk and AbilitiesEdit

Solid Air (空気凝固 Kūkigyōko?): Kosei'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 is able to break a wall as if it were made out of glass using only his bare fist, and his fist did not look injured in the slightest.


Sports Festival ArcEdit


Neito MonomaEdit

Kosei joins Neito's team during the Calvary battle.


  • His name contains the kanji for "circle" (?), "place" (?), "hardness" (?), and "formation" (?).



  1. Boku no Hero Academia Manga: Chapter 26
  2. Boku no Hero Academia Manga: Chapter 30
  3. Boku no Hero Academia Manga: Chapter 70
  4. Boku no Hero Academia Manga: Chapter 72

Site NavigationEdit

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U.A. High
Class 1-A Students Denki KaminariEijiro KirishimaFumikage TokoyamiHanta SeroIzuku MidoriyaKatsuki BakugoKoji KodaKyoka JiroMashirao OjiroMezo ShojiMina AshidoMinoru MinetaMomo YaoyorozuOchaco UrarakaRikido SatoShoto TodorokiTenya IidaToru HagakureTsuyu AsuiYuga Aoyama
Class 1-B Students Hiryu RinIbara ShiozakiItsuka KendoJuzo HonenukiJurota ShishidaKinoko KomoriKojiro BondoKosei TsuburabaManga FukidashiNeito MonomaNirengeki ShoudaPony TsunotoriReiko YanagiSen KaibaraSetsuna TokageShihai KuroiroTetsutetsu TetsutetsuTogaru KamakiriYosetsu AwaseYui Kodai
Department of Support Mei Hatsume
General Department Hitoshi Shinso
Third Year Students Mirio TogataNejire HadoTamaki Amajiki
Staff CementossLunch-RushNedzuMidnightThirteenPresent MicRecovery GirlEraserheadAll MightSnipeEctoplasmPower LoaderBlood KingGran Torino (Retired)
Locations Class 1-AClass 1-BLunch RushNurse's OfficeRecovery Girl's Branch Nurse's OfficeReplica City-DistrictSports Festival StadiumUnforeseen Simulation JointGym GammaField GammaHeights Alliance
Related Articles Unforeseen Simulation Joint

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