Hanabi Tenka is a second-year student and a key member of the table tennis club at her high school. She has a boyish appearance with short, spiky blonde hair styled into twin tails and yellow eyes. Her birthday is August 8.

In terms of personality, Hanabi is known for being energetic and having a cool, somewhat reserved demeanor. She possesses a competitive spirit that drives her offensive playing style, which focuses on delivering fast-paced returns. Before the main protagonist entered the school, Hanabi was already established as a powerful player within the club, holding the second-highest initial ranking.

Hanabi maintains a close and long-standing friendship with Hokuto, who runs a local table tennis shop, a bond that dates back to their elementary school days. She helps out at Hokuto's shop, indicating a strong and supportive relationship. At school, she is classmates with Koyori and Agari, and she has a habit of calling Koyori by the nickname magemage. Her role within the team is significant as a reliable and technically skilled player.

Her background reveals that she was sickly during her elementary school years, which makes her later athletic achievements all the more notable. A distinctive physical trait is her crooked teeth. She is always seen wearing an amulet around her neck. Her notable abilities stem from her unique playing style; she is the only member of her team to use a Chinese-style penholder racket, which suits her fast-attack approach to the game.