Oboro has medium length white hair and blue eyes. He wears black vestments with an inverse Latin cross located near his neck.
As an executioner working for the Game Master, he kills whoever he is ordered to kill, such as a CIA agent who was composing a report on Darwin's Game. He states that he will protect the Game Master as long as he doesn't give up on the game. He doesn't care if people plead for their lives, logically explaining that it was their own fault for attacking him and that he would've died if he hadn't used his sigil. He takes an interest in Sudou Kaname after Sunset Ravens wins against Eighth and later tells the Game Master that he plans to support Kaname after his win in the Hunting Game. He doesn't like enemies he considers as "classless", complaining to the Game Master to provide him with better enemies.
Skilled Fighter: Oboro is a skilled fighter as he is employed by the Game Master to deal with things, such as kill an entire group of Doume including their leader. He was able to keep Kaname on his toes when they fought.
Equipment: Oboro has multiple knives that he uses in combat, and was shown using at least 8 during his fight with Kaname.
Privilege (特権): As an executioner for the Game Master, Oboro is assumed to have a privilege.