Hasami, whose real name is Chiyoki Mugiyama, is a character from the anime Mezzo. On the surface, he operates as the proprietor of a barbershop called Mugiya, which is conveniently located on the first floor of the building that houses the DSA agency. This public-facing profession, however, masks his true identity as the leader of an illegal specialist group known as Black Scissors. This dual existence as a humble barber by day and a criminal mastermind when necessary defines his role and place within the series.

Regarding personality and relationships, Hasami maintains a complex and ambiguous rapport with the DSA team. Their interactions are frequently marked by conflict due to the nature of their respective illegal jobs, yet Hasami does not hesitate to hire the DSA for certain tasks when it suits his needs. Consequently, his standing with them is neither strictly friendly nor wholly antagonistic; it is a pragmatic, business-oriented dynamic based on mutual utility and circumstance. A glimpse into his more personal, somewhat gruff character is provided by the DSA member Mikura, who has nicknamed him Chokichoki Maccho, a moniker that likely reflects his physical presence and his proficiency with scissors, both in his barber work and his covert operations. No information is available regarding his background, internal motivations, personal development throughout the series, or any other notable abilities beyond those implied by his leadership of a specialist criminal group.