__School:__ Kaimei High School
__Class:__ 2-C (chapters 1-209); 3-C (chapters 210-288)
__Affiliation:__ Sket Dan
__Special Attack:__ Fujisaki Valencia
The founder and leader of the Sket Dan, nicknamed Bossun (ボッスン).
Bossun is known for his enthusiasm for helping others solve their problems and is quite idealistic. Given a proper backstory and relationship to his client, he's willing to go to such lengths to find even lost candy wrappers if the situation calls it. Despite his idealism, he acts childlike and is socially awkward, especially with female interactions and being filmed. One particular trait is his inability to pick up even the most obvious social cues, and he becomes easily depressed and self-conscious when insulted or being left out.
When left with nothing to do, Bossun normally would laze around or play jokes. Typically, his activities range from childlike behavior like playing with toys to being bored and reading manga. If faced with a strange situation, such with weird clients, he sometimes plays as the straight man with [Himeko](https://anilist.co/character/17245/Hime-Onizuka), and he may initially refuse the request if it's too absurd. Despite this, Sket Dan always accepts the request eventually.
Regardless of his shortcomings, Bossun is deeply analytical when facing problems and has no trouble thinking about plans. Many students consider him a genius in the arts and in logic puzzles, however, Bossun himself does not consider his talents to be any remarkable. Despite this, his talents proved to be useful when solving any problems given to him
~!On his fifteenth birthday, Yusuke discovered that he was not truly related to his mother, [Akane](https://anilist.co/character/40305/Akane-Fujisaki), and his sister, [Rumi](https://anilist.co/character/40306/Rumi-Fujisaki). His biological parents were Akane's close friends [Haru](https://anilist.co/character/42612/Haru-Kirishima) and [Ryousuke](https://anilist.co/character/40308/Ryousuke-Kirishima), who were both involved in separate car-related accidents on the day of his birth. His mother died shortly after he and his twin brother [Sasuke](https://anilist.co/character/19462/Sasuke-Tsubaki) were born, and his father died to save a child in the street.!~
