Introduction
Shu Ouma is the main protagonist for the anime series, Guilty Crown. A 17-years old student and also the member of the modern image and video research club. Due to a chance encounter with Inori, his right arm gains the "power of kings" - by establishing an eye contact with his opponents, he is able to extract special properties from the depths of their hearts that reflects their personality of their owners.
Personality
Shu is rather timid and shy, and also apathetic towards anything, thinking that there is no need to feel any concern towards anything as no one cares for his feelings. He is also smart and sharp, being able to deduce the situation pretty quickly, although his naive personality sometimes made his own situation turn for the worse.
Once he joined the Funeral Parlor, he slowly gained some self confidence, and felt that there is something he could do instead of being the outsider of world's happenings.
He first had an admiration for Inori Yuzuriha, the vocalist for the band EGOIST, and was highly surprised to met her. Soon his admiration became a crush. His relationship towards Inori is a hot and cold one, and easily gave in the thought where Inori is willing to do anything for him, where Inori claimed that she did all the encouragement is because of Gai's orders.
He also holds a complicated opinion towards Gai Tsutsugami, and often wonders why would everyone follow a ridiculous person like him. Eventually he is also attracted to his charisma, willing to help him and his organization to reach his goals.
He is currently living with his mother, a scientist working for Sephirah Genomics, and also Inori, who "forcefully" moved in with him.
Ability
As the wielder of the "Power of Kings", he possess the power to extract Voids, a form of object/weapon that reflects the personality and the fears of the owner. The objects extracted can be random and could range from a vase, fridge to practical weapons like swords and guns.
However, such ability does not work on individuals above the age of 18, so Shu can only extract objects from people who are underage. Coincidentally, almost all of the opponents he had once used his power on are students.
Technically Shu can only extract weapons that represent the true heart of the owner - hence he may not extract different kinds of object from the same owner. He can also use both Voids to combine them into one, as seen where Shu extracts a large sword from Inori and combines with Kenji Kido's gravity gun to form a railgun lookalike weapon.
His expression also changes to a more cold, heartless-like individual when fighting.