Kosei Tsuburaba

Kosei Tsuburaba, also known as Tsuburaba (ツブラバ), is a student in Class 1-B at U.A. High School, training to become a Pro Hero.

Appearance
Kosei is a young man with short brown hair, spiked up at odd angles on his head. His eyes are oval-shaped, along with his large pupils.

His hero costume consists of a simple light blue jacket, with pale pants, a black shirt underneath, and he wears large brown boots with cylindrical shapes on the soles.

Personality
Kosei is a very enthusiastic and competitive individual who holds himself to a high standard as he makes an effort to avoid descending to the level of his rivals.

However, Kosei was not above taunting Katsuki Bakugo himself after stopping the Class 1-A student with his Quirk. Similar to Neito Monoma, Kosei has no problem settling for less rather than aiming for the top.

Kosei is described as one of Class 1-B's "common-sense kings" along with Sen Kaibara, Yosetsu Awase and Hiryu Rin, suggesting that he has a milder disposition when it comes to his class' antics. While Kosei isn't the sort to attack offensively, he is described as a great backup player who uses his Quirk to aid others.

He seems to have a subtle yet rather lecherous side, which is demonstrated in how he was mostly thinking about how Tsuyu Asui's tongue was wrapped around him when he was captured.

Quirk
Solid Air: Kosei's Quirk allows him to solidify any air he breathes out, allowing him to create invisible walls and/or platforms. The solidified air continues to stay afloat in mid-air, even if someone is standing on it. The size of the wall or platform depends on his lung capacity.

Initially, these walls and platforms were not very strong, as Katsuki was able to break an air wall as if it were made out of glass using only his bare fist, uninjured. Later on, he improved his Quirk and his air walls were strong enough that it required hitting them with metal pipes repeatedly to break them.

As shown by his Ultimate Move Air Prison, Kosei's solidified air is also soundproof, allowing him to restrict an opponent's communication and making it effective against Quirks that rely on one's voice, such as Anivoice or Brainwashing.

Ultimate Moves

 * Air Prison (エアプリズン): Kosei refined his Quirk since the Forest Training Camp Arc, and is able to send out squares of air, and shape them into a box to imprison his opponent. The fact that Koji Koda was imprisoned there for a while and Jurota Shishida had problems containing Koji's strength shows that these air prisons are much more durable than solid air he has shown previously. He displays this ability in the first round of the Class 1-A vs. Class 1-B training event.

Chapter Appearances

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Anime Appearances

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Trivia

 * Kosei's surname contains the kanji for "yen, circle" (円) and "place" (場), and his first name contains "hardness" (硬) and "formation, to become" (成). Kosei's first name is also homophonous with the Japanese translation for "Quirk".
 * Kosei and Anan Kurose are the only characters in the main series so far to receive more than one volume character profile.
 * Kosei likes ball games.
 * Kosei likes any kind of live-action television that features superheroes and makes considerable use of special effects.
 * Kosei shares his Japanese and English voice actors with other characters.
 * His Japanese voice actor, Masakazu Nishida, also voices Ectoplasm, Sen Kaibara, and Mezo Shoji.
 * His first English voice actor, Aaron Dismuke, also voices Tamaki Amajiki.
 * His second English voice actor, Nazeeh Tarsha, also voices Elecplant, Daigo, and the Third User of One For All.

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