Being the seventh school mystery and the leader of the Seven Mysteries, Hanako maintains the balance in the relationship between humans and supernaturals of the school, and is often seen helping others around and protecting the school.

Hanako is cheerful, outgoing, and likes having fun. As a ghost, he is rather mischievous, then he enjoys teasing others and can be very playful and pranky. Despite his youthful persona, Yako and Tsuchigomori respect him and follow his orders as fellow school mysteries. He can become very serious at times, but at other times he appears very flippant. Hanako is also a bit sadistic at times, as shown when he happily threatened to turn Yako into fox udon (he often threatens others with his kitchen knife). Yashiro Nene describes him as someone who is difficult to understand.

Hanako's personality is similar to that of when he was human, except for the fact that he was very passionate and knowledgeable about astronomy and dreamed of being an astronaut. However, he no longer talks about the subject. Furthermore, when he was alive at least in the school, he seemed more closed and shy. He doesn't like talking about or being reminded of his past due to the negative associations.