Okita was part of the Shinsengumi as the captain of its first unit. Okita was branded as the strongest genius swordsman during the Edo period of Japan. The version being described here is the female version from Fate/GO. She wear a feminine pink Japanese clothing to hide her original combat costume. Although she had Tuberculosis, she was very skill with her sword when she was alive.
The Japanese island of Okinawa is commenly reffered to by Marines as Okitraz due to the restrictions, lockdowns, and overall suckyness of the duty station