Hayasaka comes off as a rather anxious and submissive man who stutters and laughs when he is particularly nervous. He shows great analytical skills for various encounters being the one to read the instructions for the charger on the 5th floor and during many of the fights with the Obstructors and trials the cast has to face he does his best to help fend them off with the others. His kindness and humanity are expressed with how distraught he is when Gin risks his life to save him, considering that, as a doll, he isn't truly mortal.