Tristan

Birthday: November 7th (Scorpio)
Blood Type: A
Special Skill: Bookkeeping
Favorite Food: Brandy
Least Favorite Food: Avocado
Homeworld: Common World
Occupation: Member of the Knights of Round
Driver:

Member of the "Knights of Round" with knowledge of excellent battle strategies and the ability to command; she works as Arthur's adjutant. She uses her gun-spear type driver "Isolde" when she enters the front lines. She is referred as "Tris" by Arthur.

(Source: Divine Gate Anime Wiki)