★ Name: Sylvia Yamaguchi
★ Age: 46
★ Gender: ♀
★ Date of Birth: 1st November
★ Star Sign: ♏ Scorpio
★ Blood Type: A
★ Height: 168cm
★ Homeroom: 3A
★ Likes: Good books, peace & quiet, knitting & embroidery, going to shooting range to train her eyesight, polishing her guns, classical music, cleanliness (but will get down and dirty if she has to.)
★ Dislikes: Undisciplined, no mannered & crude people, tardiness,
★ Personality: Conservative but is pretty open with a lot of things, STRICT, motherly, patient & tolerant, fussy about details, can be very picky with certain things like clothes and food, headstrong and determined.
★ Biography: A German mother and a Japanese father, Sylvia takes her father's side and resides in Japan in most of her childhood. Her father was a professor from a university and her mother was a stay at home wife. Always spent her time with her father, watching him research about the subjects he taught, observing him writing his reports. He taught natural sciences before he retired.
After graduating with a teacher's degree (she took astrology she's more interested in the study of the stars), she got married to a very wealthy man. Both had a daughter. Unfortunately her marriage did not last as her husband had found someone new and left. After the divorce, she has to take care of her parents and her daughter. One night, her daughter disappeared. Alas, she was found but not breathing. Leading Sylvia to distraught, she was unable to teach for a long time until her cousin told her about Hoshizora High because he sent his son there before. Finally, Sylvia gets back on her feet and tries to rekindle that love of teaching and sharing knowledge with others.