
They would have a hard time to know who is a friend and who is an enemy since they aren't sensitive). Thanks to this, he can easily and quickly categorize people into two distinctive groups: hostile and non-hostile (while normal people would see 3 types: hostile, neutral and friendly. His emotions are merely skewed in a certain direction, with one particular half becoming especially sensitive. At home, he generally wears a nondescript black shirt and pants. Tatsuya is normally wearing his green, white, and black school uniform, lacking the eight-petaled flower emblem on his blazer during his first year. In the anime, he has dark hair that reaches his clear blue eyes in several unevenly cut bangs - he shares only his eye color with his sister Miyuki. He is usually expressionless and very rarely does he get surprised or enthusiastic, and whenever he does, however, it's often at the minimum level. He's also described through other characters' impressions as serious and competent-looking. Tatsuya is 172.9cm tall (178.8cm in Volume 3), well-built and often described as mundane-looking compared to other characters in the series. He was voiced by Yuichi Nakamura in the Japanese version, and by Alejandro Saab in the English dubbed version. He uses Material Burst three times so far, once in anger when the Great Asian Alliance invaded Okinawa in 2092, and twice during Scorched Halloween three years later. He wields several personal magics, Gram Dispersion, Mist Dispersion, Regrowth, and Material Burst(Strategic Class Magic). He is also part of the JSDF 101 Independent Magic-Equipped Battalion, a highly elite magical fighting force, despite being in high school. Unfortunately, the artificial magic operation area is markedly inferior in performance to that of a natural one, and he could only end up being used as a Guardian.

Tatsuya was granted the ability to wield magic, but still not par to what they expected. Miya used the forbidden Outer-Systematic Magic "Mental Design Interference," forcibly altering the area in the consciousness that creates strong emotions, called the limbic system, by inputting an Artifical Magic Calculation Area, creating an artificial Magician. In hopes that his magical abilities would improve, his mother, Shiba Miya and her twin sister, his aunt, Yotsuba Maya, experimented on the six-year old Tatsuya. He was born without any magical ability apart from decomposition and regrowth, which was unacceptable to the Yotsuba clan.

It is also stated that this is done because Tatsuya is "still an underage student", so he couldn't patent his own theories. It is later revealed that Tatsuya is "'half' of Taurus Silver" who is considered as an ingenius CAD Engineer, while the "Taurus" part came from Ushiyama, who Tatsuya calls Mr. Tatsuya appears to have a very cold personality except when it comes to his sister. The school is split between the high scoring students, blooms, and the low scoring students, weeds. Miyuki scores at the top of the class of freshmen, while Tatsuya scores near the bottom in the technical skills portion. Since he was born in April and Miyuki born in March, they are studying in the same year according to Japanese school system. He is the eldest son of Four Leaves Technology (FLT) company's president, part of the Yotsuba clan. Tatsuya Shiba is a First Year Student in Course 2 of the First High School.
