Rei Fukai  

, 深井 零

Lieutenant Rei Fukai is an officer in the Special Air Force (SAF), which serves as the reconnaissance unit of Fairy Air Force (FAF). He flies the aircraft B-503 "Yukikaze." It has been noted that he tends to avoid social interactions and only shows interest in objects related to his work, such as B-503 "Yukikaze," James Bukhar, Edith Foss, and Tom "Tomahawk" John.