Touma is the son of Kamijou Touya and Shiina. Touma was hated by many people due to his bad luck (his bad luck affected people around him).
Touya sent Touma to Academy City (A place where people with superpower able to live free) after he graduated from kindergarten to freed him from thing he experienced.
Power & Ability
Touma ability is the imagine breaker (A mysterious power that reside in his hand that he has had since birth). It's able to negate supernatural power like esper, magic and divine power.
However his weakness is his bad luck, his imagine breaker negate his own luck.
He use to dives into problem without knowing the consequences, he always wanted to help another person even if it means he had to risked his own life.
Touma thought he always caught into a problem was due to his bad luck, because of his point of view he cursed his luck without knowing the truth.