OVA
Description
Kintarou Toyama is a first-year student representing Shitenhouji Junior High and is a central figure among the middle schoolers selected to join the Under-17 training camp. Born on April 1, he stands at 151 centimeters with a weight of 52 kilograms and has B-type blood. Known by the nickname Kin-chan, he is characterized by his bright orange hair and a physique that is small for his age, which belies his immense physical power.

In personality, Kintarou is overwhelmingly cheerful, carefree, and naive. He speaks in a somewhat simple manner and frequently misreads kanji, which leads him to mispronounce names, most notably calling his rival Ryoma Echizen by the misreading Koshimae. His imagination is very active and often literal, leading to misunderstandings. For example, upon hearing that Ryoma has san paku gan, Kintarou believes his rival has three eyes instead of the whites of his eyes showing. He is also known for a deep-seated, comical fear of his own captain, Kuranosuke Shiraishi, because he is convinced that the bandages on Shiraishi's arms conceal lethal poison claws, a belief stemming from a manga he once read. Despite his frightening strength, he dislikes studying and academic subjects, preferring physical activity and eating, with takoyaki being his favorite food.

Kintarou's primary motivation is simply to have fun playing tennis against strong opponents, a pursuit that drives him to constantly seek greater challenges. He has a naturally competitive spirit and does not show fear on the court, even when facing seemingly insurmountable opponents. His initial goal upon entering the Under-17 camp is to become the number one tennis player in Japan.

Within the story of the OVA vs. Genius 10, Kintarou plays a pivotal role as one of the middle school rebels who challenge the dominance of the high schoolers in the camp. After undergoing intense mountain training under Coach Mifune, he demonstrates explosive growth. His most significant contribution is his official challenge against Juujirou Oni, the fifth-ranked player among the Genius 10. This match becomes a defining moment, as Kintarou pushes the formidable Oni to his limits and, in the process, manages to achieve Teni Muhou no Kiwami, also known as the Pinnacle of Perfection. Though he ultimately loses the match, his performance forces Oni to also reach that same state, earning the respect of the entire camp and securing his place as the sixth middle school representative for Japan.

His key relationships are defined by rivalry and respect. His most notable dynamic is with Ryoma Echizen, who is seen as his counterpart from the East. Their competitive yet friendly rivalry is established before the camp and continues to motivate both players. Within his own team, he has a complex relationship with Shiraishi, mixing fear with the typical teammate bond. During the Genius 10 arc, his primary relationship is with Juujirou Oni, who acts as a formidable wall that Kintarou must overcome to grow, serving as both an adversary and a catalyst for his evolution.

Kintarou exhibits significant development in this arc. Initially portrayed as a raw, instinctual talent of immense power, he refines his abilities through disciplined training. The match against Oni marks his transition from a promising rookie to a player who can unlock the highest level of tennis, showcasing not just physical strength but immense concentration and a pure, joyful state of mind in competition.

His notable abilities are classified under an all-rounder playing style, though it is wild and relies heavily on his natural stamina and explosive power. He is exceptionally strong, able to lift a scooter with ease. His signature technique is the Super Ultra Great Delicious Mountain Storm, a powerful and acrobatic smash performed after a spinning jump. He also possesses a super-powerful serve called the Super Megaton Deluxe Volcano Serve. Upon achieving Teni Muhou no Kiwami, his hair and eyes shine brightly, and his already formidable speed and power increase dramatically, allowing him to keep pace with the nation's best high school players.