Takekazu Ejiri attends Yamanami High School, sporting wild maroon hair in an undercut, medium-toned skin, and burnt-orange eyes. He habitually wears his school uniform loosely with minimal effort. Ejiri embodies a noisy, hot-blooded, and confident personality, quick to engage in fights without backing down, often exhibiting a feisty and occasionally violent demeanor. During junior high, he belonged to the baseball club but remained mostly on the bench, fueling a strong desire to actively participate and make a name in sports. This motivation drove him to join Yamanami High's water polo club as goalkeeper, a decision sparked by Minato Kiyomizu’s speech on memory loss and personal expectations. The water polo club captain, Jō Jōjima, nicknamed him "Boo" during their interactions, and the name persists.