Taiga Fujimura is the cheerful and easygoing homeroom teacher for Illyasviel von Einzbern's class at Homurahara Academy Elementary School, popular among students. However, her temper flares when provoked, resulting in powerful outbursts. She typically wears a green dress over a yellow and black striped shirt with white shoes, adopting a yellow tracksuit with black details during the Prisma☆Phantasm storyline.

Standing 165 cm tall and weighing 53 kg, she is nicknamed "Tiger" due to the phonetic similarity of "Taiga" in Japanese, a moniker she dislikes. Shirou Emiya calls her "Fuji-nee" (older sister Fuji), reflecting their close familial bond. After Kiritsugu Emiya's death, Taiga became Shirou's legal guardian and has lived with him for years. She frequently visits the Emiya household for meals, especially enjoying Sakura Matou's cooking, and often saves breakfast leftovers for lunch.

Taiga exhibits occasional protectiveness over Shirou, initially viewing newcomers like Saber with suspicion as potential disruptors. In class, she displays a "rustic, boyish" side when addressing disruptions, though her anger subsides quickly and she is easily distracted. Despite her dedication to teaching, she sometimes neglects lesson preparation. No additional background story or development beyond these appearances in the *Prisma Illya* universe is documented.