Name: Keigo Atobe The scion of the Atobe Zaibatsu and extremely wealthy. His signature line is "Be intoxicated by my beautiful technique." His catchphrase is "Ahn," and he also says, "I am the King!" He lives in a palace, owns numerous villas, and has donated top-tier facilities to Hyotei.

Name: Yushi Oshitari Hyotei's genius who fights with a cool head, never letting his opponent read his emotions. Originally from Osaka, he speaks with a regional drawl. While he has a cool and calm personality, he is usually friendly, talkative, and attentive to those around him. Because he is good at taking care of others, he often finds himself acting as an MC or the straight man (tsukkomi) in group settings. He is characterized by shoulder-length blue hair and round glasses. The glasses are non-prescription; he wears them because he is "embarrassed to let people see his bare eyes." Called the genius of Hyotei for his excellence in game-making. He reportedly has a thousand techniques and can prevent opponents from reading his mental state by closing off his heart. Coming from a long line of doctors, he is likely to become one himself; after the Nationals, he worked as a trainee at a hospital through his parents' introduction.

Name: Gakuto Mukahi Characterized by his red bob cut. His catchphrases include "-miso" and "Damn, damn!" Though he has a lovely appearance that could be mistaken for a girl at first glance, he is short-tempered, stubborn, and has an impatient, headstrong personality where his body moves before he thinks.

Name: Ryo Shishido A hard worker with a stoic, manly personality. He has scars all over his body from his intense training with Otori, and always wears a bandage next to his left eyebrow. His catchphrases are "Super uncool" and "Kinda uncool." He is childhood friends with Gakuto Mukahi and Jiro Akutagawa.

Name: Jiro Akutagawa He loves sleeping and is often found napping or half-asleep. However, once he wakes up, he undergoes a total transformation and becomes very noisy. When awake, his personality is cheerful, generous, and innocent. He is a lighthearted person who is playful in any situation and stays true to his instincts. He is a hidden talent who is the only one in the strict, merit-based Hyotei to enjoy tennis at his own pace. He speaks by adding English letters to the end of his sentences, such as "Happy-C" or "Cool-E." He is childhood friends with Ryo Shishido and Gakuto Mukahi, and he lives right next door to Gakuto. He calls his junior, Kabaji, "Kaba-chan," and often relies on him to be carried around while he's sleeping.

Name: Wakashi Hiyoshi His motto and catchphrase is "Gekokujo" (overthrowing the superior). He has a slender appearance characterized by straight brown hair and a cold gaze. He tends to be a bit high-strung but has a strong desire to rise to the top and a competitive personality, often making provocative remarks to both allies and enemies. Behind that attitude, however, he is a very hard worker. Perhaps because his family home is a traditional martial arts dojo, his room and tastes are Japanese-style. As seen in his profile, he is an occult enthusiast who enjoys visiting the Seven Wonders, mystery spots, and ruins, and he loves horror. While his cheeky attitude stands out, he joined the tennis club because he was captivated by the beauty of Keigo Atobe's tennis; he has a strong admiration for Atobe, which is why he is so obsessed with "overthrowing" him.

Name: Chotaro Otori He has a kind and gentle personality, to the point of wishing for world peace. He deeply respects his doubles partner and senior, Ryo Shishido, and is even willing to give up his regular spot for him. He is often heard saying "Shishido-san" at any given moment. Shishido also treasures Otori, and they have built a strong relationship of trust. In addition to his good personality, he is tall and has handsome features. He is also somewhat prone to tears, often seen crying in the original manga and anime. He always wears a cross necklace, but he isn't particularly religious; he wears it as a lucky charm.

Name: Munehiro Kabaji Extremely taciturn, he rarely says anything other than "Usu" (Yes). He seems to hold great respect for Atobe, whom he has known for ten years, and is always following behind him. His ability to copy techniques applies to things other than tennis as well. However, since it is just an impromptu copy, each technique is only used for that specific match, and there are no depictions of him using them again in subsequent matches.

Name: Taro Sakaki Gender: Male Occupation: Music teacher at Hyotei Academy Middle School, Advisor to the Boys' Tennis Club Height: 183cm Age: 43 years old Weight: 64kg First person: I (formal) Second person: You (by surname) Clothing: Dark brown suit, light blue shirt, pink scarf Hairstyle: Swept-back hair (up-bang) Hair color: Brown Blood type: O (A in some profiles) Birthday: March 14th (May 24th in some profiles) Zodiac: Pisces Dominant hand: Right Hobbies: Listening to music (using a gramophone), collecting SP records, archery Favorite food: Filet of beef en croûte, Burgundy-style beef stew Favorite color: Amber Other: He appears gallantly wearing a flashy suit and scarf, looking more like a high-end socialite than a tennis coach. His signature line is the Hyotei-famous "Go!" while holding up two fingers. He dislikes popping candy, which he apparently received from a student. Judging by his fountain pen and other items, he is well-loved by his students.