Ayatsuji appears as a cold and emotionless man, though fairly odd as he has a basement full of dolls.
Ayatsuji is also a very intelligent man (as expected of a detective) that he may or not be just as smart as Ranpo.
But Ayatsuji is a very dangerous man, dangerous enough to be seen as a threat by the government and to be put on the list of Extremely Dangerous Ability Users.
He is on the list of Extremely Dangerous Ability Users, and is thus being closely monitored by the Special Ability Department; agent Mizuki Tsujimura is assigned to watch him.
A plan called 'Exterminate Extremely Dangerous Ability User, Ayatsuji Yukito’ gets submitted to the higher-ups in the Special Ability Department 2-3 times a week but continues to get rejected due to the usefulness of his ability.
He is first seen wrapping up a murder case that took place in an outer school. A student of the school died, and thought to have been poisoned.
- He prefers his coffee with two spoons of brown sugar and no milk.
- He owns two cats.