Kosei Tsuburaba

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

Appearance
Kosei has short spiky hair and large oval eyes.

Sports Festival Arc
Kosei comes in 23th place during the Obstacle Course. 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.

School Trip Arc
On the day of the forest lodge trip, when Neito Monoma mocks Class 1-A, Kosei is seen observing.

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.

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 Abilities
Solid Air (空気凝固): 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 Arc

 * Team Bakugo vs. Team Monoma: Loss

Neito Monoma
Kosei joins Neito's team during the Calvary battle.

Trivia

 * His name contains the kanji for "circle" (円), "place" (場), "hardness" (硬), and "formation" (成).