TV-Series
Description
Hōō Byōdōin, Japan's top-ranked U-17 tennis player and national team captain, stands 189 cm tall with long blonde hair, a trimmed beard, and a forehead scar from a past match. A larger scar on his back, sustained during international competition after showing kindness to an opponent, solidified his belief that compassion weakens competitive tennis.

Two years before the main storyline, as a first-year high schooler at the U-17 Camp, he faced Jūjirō Oni in a fierce match. Demonstrating "inter-dimensional" power through techniques like Pirates of the Americas and Snake Charmer of India—which split tennis balls into multiple trajectories—he lost 7-6, earning the forehead scar. This defeat drove him to cliffside training and intensified his fixation on victory. He traveled globally, adopting a brutal style that traumatized international opponents into quitting tennis.

One year later, he effortlessly defeated Kazuya Tokugawa, targeting his body to inflict pain and rouse him from unconsciousness, establishing a recurring rivalry. Tokugawa remained his only granted rematch opponent. Returning to the U-17 Camp with top-ranked players, Byōdōin authorized middle schoolers to challenge for top-10 positions after witnessing them defeat top-20 members. His aggression surfaced when firing destructive serves at an exhausted Tokugawa and Ryoma Echizen, halted by Ryoma’s brother Ryoga.

During their Genius 10 Challenge rematch, the score reached 6-7, 6-0, 3-5 (Tokugawa leading the final set) before Tokugawa collapsed, weakened by Byōdōin’s prior "Glowing Shot" injury. Byōdōin unveiled global training techniques: Bull Fighting of the Spanish, Phoenix of Egypt, Pirates of the World, and Matryoshka of Russia. His skeletal pirate aura clashed with Oni’s Kishin form. Privately acknowledging Tokugawa’s strength, he scorned his persistent kindness as detrimental to Japan’s U-17 World Cup ambitions.

Before the World Cup, during a beach task, he formed an unexpected rapport with Shūichirō Ōishi, who called him "boss" alongside Duke Watanabe. He intervened in a mafia confrontation using tennis skills. In the World Cup semi-finals against Germany, he defeated Jürgen Borisovich Volk 4-6, 7-6, 7-6 in Singles 1, securing Japan’s advancement.

His hobbies include handwriting Buddhist sutras; his favorite food is green tea. His name derives from Byōdō-in Temple’s Phoenix Hall (鳳凰堂, Hōō-dō) in Kyoto. He uses a Head Youtek Graphene Speed Pro racquet and wears Adidas Adizero Ace II AC M shoes.