Touma is a 14-year-old boy genius who graduated from the Stockholm Royal University of Science at the age of 12. His abilities are considered elite, even within DATS. He bases his operations on data and theoretical principles, and as such his personality clashes with Marcus's. His mother is Japanese and his father is a prominent Austrian aristocrat named Franz Norstein. He also has a younger sister, Relena, who suffers from a strange disease. Calm and shrewd, he is the exact opposite of Marcus and sees him as a rival. He has an elitist attitude but he gets emotional when thinking of his mother, who died years ago when he was young.

Touma's loyal partner is Gaomon, who always addresses him as "master" and gets angry easily when he thinks someone is not treating Touma with the proper respect. It has still yet to be revealed how the two actually met.

(Source: Wikipedia)