TV-Series
Description
Jusaburō Mōri is a first-year high school student at Rikkaidai University High School, standing 191.63 cm tall and weighing 83.02 kg. His height makes him one of the tallest Japanese players in the series. He possesses long, wavy brown hair reaching his shoulders. During matches, he wears the red Japanese U-17 high school representative uniform, retaining his jacket without switching to shorts. He wields a Dunlop Biomimetic M.30 racket, wears Dunlop Hybrid Pro II shoes, has unaided 2.0 eyesight in both eyes, and plays right-handed.

Mōri holds the No. 10 position among Japan's U-17 representatives as part of the Genius 10 group. Camp coaches paired him with Ochi Tsukimitsu to deter Mōri's practice absenteeism, forming the doubles partnership "Super High School Doubles Specialists." Initial struggles caused Ochi's rank to drop from No. 4 to No. 17, while Mōri rose to No. 18. After Mōri vowed to restore Ochi's standing, their partnership solidified; Mōri began calling Ochi "Tsuki-san," respects him deeply, and follows his match instructions, showcasing strong compatibility.

He attended Shitenhouji Middle School in his first year, befriending Hara Tetsuya at a welcome event before transferring to Rikkaidai Middle School before August. He became a regular on Rikkaidai's tennis team but frequently skipped practices, limiting teammate Yanagi Renji's performance data. During the Nationals one year prior to the current storyline, he defeated Shitenhouji's Oshitari Kenya in straight sets without conceding a game. Upon graduating to Rikkaidai High School, his talent earned special treatment, though practice attendance remained inconsistent.

His carefree attitude and absenteeism during Yukimura Seiichi's hospitalization caused resentment among Rikkaidai juniors Yukimura, Sanada Genichirō, and Yanagi, who perceived him as taking tennis for granted. A turning point came after a 0-6 loss to Hyotei's Ochi Tsukimitsu at the Kantō Singles Tournament, where Mōri sustained an injury. While hospitalized, he contemplated quitting tennis but witnessed Yukimura's intense rehabilitation. Inspired, Mōri began rigorous daily training. Secretly, he left cold sports drinks for Yukimura after rehab sessions, leading Yukimura to believe a "Sports Drink Fairy" encouraged him. Mōri later won a newcomers' tournament without dropping a set, earning a U-17 Selection Camp invitation.

At camp, Mōri initially displayed Genius 10 arrogance. During challenge matches, he and Ochi faced Atobe Keigo and Niō Masaharu. Niō mimicked Tezuka Kunimitsu using illusions like the Zero Shiki Serve, which Mōri countered. The match extended to three sets; Mōri dislocated his shoulder to neutralize Atobe's "Atobe Kingdom." They lost the third set 6-7, temporarily costing Mōri his No. 10 position to Niō. He was reinstated after Niō's hospitalization and the allocation of separate spots for middle schoolers.

In the U-17 World Cup quarterfinals against France, Mōri partnered with Yanagi Renji for Doubles 1. Lingering resentment over Mōri's behavior during Yukimura's illness caused poor early coordination. Yanagi recognized the sports drink Mōri placed on their bench—identical to those Yukimura received—realizing Mōri was the "Sports Drink Fairy." This reconciliation enabled effective collaboration. To enhance Yanagi's data collection, Mōri entered a "Sleeping State" during play, shattering opponents' analysis. They secured victory against France's Jonathan Saint Georges and Edgard Delacroix.

Mōri strategically dislocates his joints during matches, demonstrated when bypassing security to alter the World Cup lineup and against Atobe and Niō. His playstyle is that of an adaptable all-rounder. Off-court, he maintains a cheerful, upbeat demeanor, though his tendency to avoid serious commitments persists. He claims to get along with anyone but had historically strained relationships with his former Rikkaidai juniors, relationships gradually improving through shared experiences and World Cup reconciliation.

Reinstated as No. 10, Mōri continued U-17 activities, including an intra-ranking tournament before the World Cup finals. He partnered with Ochi for Doubles 1, advancing through rounds after Ochi unveiled his true abilities as the former No. 4 player.