Holy crap in the latest episode the white haired dude tells Oori that hes the son of a corpse. I'm guessing a priest and a shikabane fell in love and gave birth to Oori. Its seems he has a new ability to, his eye turned red and he could see the balloons that he couldnt see before.
This explains why he can make a contract with a shikabane and still have unique coprse ability's cause he's half corpse half human. Thats probably why he has a facination with death to, cause in a sense he's already half dead. He's already used a powerfull zadan technique and now he's starting to gain corpse like ability's. With the power's of a priest and corpse Oori could become extremely powerfull.
This explains why he can make a contract with a shikabane and still have unique coprse ability's cause he's half corpse half human. Thats probably why he has a facination with death to, cause in a sense he's already half dead. He's already used a powerfull zadan technique and now he's starting to gain corpse like ability's. With the power's of a priest and corpse Oori could become extremely powerfull.