Kamijou Touya

Kamijou Touya is Touma's father. He is a businessman who travels a lot and collects various good luck charms due to Touma's unnatural streak of bad luck. He may seem silly at times but he does cares about his wife and son. He is partly responsible for causing Angel Fall, the spell that threw off a powerful angel in Heaven onto Earth without him knowing about it.

Personality
Even though he is now happily married to her and has no interest with other women, like his son, he still manages to attract women, much to the chagrin of his wife and his own colleagues, who often complain that Touya's flaunting the fact he has a young wife (though the colleagues might just be jealous) yet still attracts women.

In the anime, he also gets a happy look on his face whenever he sees an attractive woman, much to his wife's irritation, though he still loves her dearly. In the light novels this is non-existent, compared to the highly exaggerated version in the anime.

Angel Fall Arc
He was properly introduced as Touma's dad during this arc. He shown most of his personality traits in this arc and he was oblivious to the whole disaster that he caused. It should be noted that he has was quite sharp when it came to observing the behavior of his son, quickly assuming that Sasha Kreutzev might have a thing for him judging from her "shy behavior" around him.

Daihasei Festival Arc
He has a minor role in this arc and virtually acts "as a tourist" the whole time. In this arc it is revealed that Touya might have a charisma to attract girls much like his son, however he either doesn't seem aware of this or actually doesn't care at all; referring himself as a happily married man. Touya gets acquainted with Misaka Misuzu during this arc as well, however his wife establishes a deep friendship with her.

Later events in the novels
Volume SS2 reveals that Touya's job is to prevent others buying shares of the company he belongs to for the purposes of hostile takeovers, a job that requires extensive knowledge of the economy and human psychology. In the same novel, he meets Lidvia Lorenzetti on one of his oversea trips, and after talking about the misfortune of his son and implying there's nothing anyone can do about it, Lidvia gives him a magical good luck charm that's undetectable by other magicians unless it is used actively for a spell, since she thrives on solving seemingly unsolvable problems. Unknown to the both of them, this good luck charm ends up being the catalyst to activate the spell 'Angel Fall'. In Volume SS2 he has also met Misaka Tabikake in a bar and unwillingly helped the Gemstone Girl to escape from her pursuers.

Quotes
(During SS2) “''Talking to a prostitute in a rundown bar in a stylish city like London seems pretty dangerous to me. Not even the protagonist of a manga that’s always getting in trouble would do something as dangerous as this. It’s like stepping out on a suspension bridge when the ropes are about to snap.''”

Trivia

 * In the Angel Fall arc, in the anime is Touya who suggest going to the onsen with Touma, in the novel it is Shiina and Otohime who suggest that.
 * When Misaka Mikoto saw Touya's antics she noted that his silly behavior to girls was just as bad as Touma's.