Toshiya Sato (佐藤寿也 Satou Toshiya?) is Goro Honda's best friend during childhood and longtime rival through baseball in the MAJOR series. He then makes a reappearance in the MAJOR 2nd sequel as Hikaru Sato's father, supporting and coaching both sons of his and his best friend.
Toshiya Sato was first introduced as a timid kid who wore glasses, but eventually dropped them while growing into a handsome young man. Over the years since Season 2, Toshiya's eventually grew into a handsome young man both athletic and academically which remains unchanged after adulthood.
Toshiya was a shy boy who focused on studies, giving him trouble making friends. Goro helped him overcome this and became very skilled playing with Goro, especially at catching Goro´s fastballs. His mother threw out the baseball glove that Goro lent him. Goro saw this and misunderstood. Once Toshi found out, he searched for hours in the trash until he found it.
After the Deadball incident, Toshi encourages Goro to still keep playing.
Toshi was first introduced in the new season after saving Ayana Suzuki from faling downstairs, with the latter of her and her friend developing a crush on him.
Later he turns down a practice game with Goro's team, and criticizes Goro's pitching, which Goro's new dad confirms lacks sharpness.
It was revealed after reaching 6th grade when Goro moves away, Toshiya discovers his home empty to find himself abandoned by his family when they go bankrupt, and was is taken in by his grandparents. He has then worked hard to earn a good scholarship and going to the pros so repay his grandparent's hard work. His progress made him being the captain of his middle school team and specializes in batting.
Toshiya is the starting catcher, fourth batter for Kaido and alongside the team's ace Mayumura.
It is mentioned that Kaido had won the last National Championship (which occurs between the 2nd and 3rd season) with very little opposition. The superiority of Kaido influences Toshi to become arrogant and forgetting his rivalry with Goro. This situation displeases Goro who promises Toshi he will beat Kaido.