|Also Known As|
|Family|| Unnamed wife (deceased)|
Masato Koga (son)
Megumi Koga (daughter)
|Team(s)||Fukuoka SoftBank Hawks|
|Anime Debut||MAJOR: The Winning Shot of Friendship|
|Voice Actor||Kenji Hamada|
Tetsuya Koga is the father of Masato Koga and Megumi Koga in MAJOR: The Winning Shot of Friendship. He meets Hideki Shigeno at the 2nd string training grounds after losing his position due to an elbow injury.
- Like Shigeharu, he also lost his wife.