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