Yūsuke Fujisaki / Bossun
Present | Young | Biscuit Dance
藤崎 佑助
Fujisaki Yūsuke
Nickname Bossun (ボッスン)
Bosshūton (ボッシュートン)
Bossman (ボッシュマン)
Borsalino (ボルサリの)
Milk (ミルク)
Age 16 (chapters 1-86)
17 (chapters 87-present)
Birthday November 11, 1992 (manga)
November 11, 1994 (anime)
Gender Male
Blood Type AB
Height 171 cm
Weight 57 kg
Eyes Light Brown
Hair Black
School Kaimei High School
Class 2-C (chapters 1-209)
3-C (chapters 210-present)
Likes Fried food, mandarin jelly, hamburgers, robots
Dislikes Ghosts and phantoms
Affiliation Sket Dan
Sket Bombers
The Sketchbook
Relatives Akane Fujisaki (adoptive mother)
Rumi Fujisaki (adoptive younger sister)
Haru Kirishima (biological mother)
Ryōsuke Kirishima (biological father)
Sasuke Tsubaki (twin brother)
Manga Debut Chapter 1
Anime Debut Episode 1
Seiyū Hiroyuki Yoshino

Yūsuke Fujisaki (藤崎 佑助), or Bossun (ボッスン), as he is more commonly called, is the leader of the Sket Dan.


On his fifteenth birthday, Yūsuke discovered that he was not truly related to his mother, Akane, and his sister, Rumi. His biological parents were Akane's close friends Haru and Ryōsuke, 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 were born, and his father died to save a child in the street.

Not certain how to handle this new information and the idea that he was utterly without blood relatives, Yūsuke ran away from home and wandered around aimlessly. After meeting Taisuke, who had been the child his father saved, Yūsuke received the present that Ryōsuke had meant to give to Haru after the birth. The letter inside, written to the then-unborn children, talked about how they should help other people. However, angry that his father's mentality had resulted in the man's death, Yūsuke flung down the letters and claimed that he would only live for himself. After watching some upperclassmen bully a student his age, he discovered that he had truly inherited his parents' blood because he couldn't resist stepping in to help (the student was later revealed as Tsubaki) - though he ended up being beaten himself. Later, after having accepted his circumstances, he returned home and continued to live with Akane and Rumi, stating that they are the only family he has ever known.


Bossun has messy dark hair that curls upward on either side, above his ears. He is almost always seen wearing a red, horned Poppman cap and goggles. His most common outfit consists of a white shirt with the sleeves rolled up over a blue-and-white shirt of his own design which has the word SKET across the front, blue knee-length shorts, black bands on both ankles, and a pair of sandals. He wears wristbands on both wrists - one with red, white and blue stripes and the other with the Sket Dan symbol on black. Attached to his shirt are several pin buttons. He has a wide range of facial expressions, most notably his "embarrassed" face, where he purses his lips comically.


Bossun is particularly know for his enthusiasm in helping others, and he is quite optistmic and righteous. Bossun will do anything to get the request done and right, even if it causes him humiliation and embarrasment. Despite that he is weak and cries easily, he will fight to protect his friends from danger.

Major Story Arcs

For plots centering on Sket Dan requests, see Requests.
For alternate universe plots, see Alternate Universe Stories.

The Fake Onihime

Kindergarten Performance

Gachinko Vivage Battle

Kaimei Rock Festival

Bossun wonders why Hime practices on her guitar in which she says that the Kaimei Rock Festival has started and it is showed that Hime and Switch joined bands which left Bossun without a band since he doesn't know any instrument to play.

After days has passed, Hime agrees to teach Bossun on some basics on a bass and eventually learns how to play it skillfully and even gets invited to a band finally in which he sends a message to the Student Council that he would await their battle in the Rock Festival.

Througout his practice in the music room, he meets Sagisaki who Rumi states that is a violinist prodigy. After sometime, both become close in which Sagisaki helps Bossun in the tunes of his guitar, Bossun also notes that Sagisaki doesn't have that much confidence in her skills in which he encourages her.

Then, the bands that Hime and Switch joined disbanded due to some reasons. Because of that, Bossun gloats that he still has a band, but later it is revealed that the 'Sket Bomber's' drummist got injured so it also disbanded. With that, Bossun has an idea of starting it's own band, called 'The Sketchbook'.

At the festival, he hopes to see Sagisaki watch him play and at the ending of the first song his band played, Sagisaki arrived. He performed another song, which he dedicated to Sagisaki. The song was originally by the 'Pillow's' in which Sagisaki goes into tears and Bossun at the end successfully changes her mind to follow her dream and go to Germany.

Bossun's 17th Birthday

Defeat the Fortune Teller

You've Got Mail!

School Trip Rhapsody

Trouble Travel

Bossun, Switch and a group of male classmates plan to go on a camping trip with Remi's brother Shin during Golden Week. However, when Remi manages to break Shin's car, the trip is cancelled and the Sket Dan end up traveling to Osaka instead, as per an invitation from Himeko's old friend Sumire. However, when Himeko discovers that Sumire is being extorted by an ex-boyfriend, she secretly goes to confront him and ends up kidnapped.

As soon as Bossun and Switch realize this, they figure out Himeko's location and go to rescue her. Things get serious when her kidnappers turn out to be a gang who ambush Bossun and Switch and knock them unconscious before tying them up. Though the pair are able to free themselves, Switch is attacked soon after and it's up to Bossun to rescue Himeko on his own. Using his slingshot and concentration mode, he takes out the gang members one by one until coming face-to-face with their leader, Tsune, who has Himeko captive.

Tsune manages to rid Bossun of his remaining ammo, and the latter ends up shooting a takoyaki ball as a result. Using Tsune's momentary distraction, Bossun punches him in the face. After he unties Himeko, she suddenly hugs him with relief and he finds himself at a loss as to how to respond - hesitating to return the hug.

At the end of Golden Week, Sumire comments to Switch on the relationship between Bossun and Himeko before seeing the trio off.

Special Abilities

Concentration mode
  • Concentration Mode: Bossun is able to utilize an extraordinary level of perception when he equips his goggles and mentally recalls relevant facts to the problem at hand. His perceptiveness is so keen that he can even make out distant sounds in the background of a phone call. This level of concentration also makes him an excellent shot with the pachinko ball slingshot he uses as a weapon. After using this ability, he often ends up taking deep breaths like a diver resurfacing.
  • Artistic Talent: He is, comically, an extraordinary artist - both in 2-dimensional and 3-dimensional form, as evidenced by his stints making origami and figurines. His fellow club members have joked that his artistic talent is a strange one for a manga protagonist.
  • Vocal/Facial Impressions: He is able to do spot-on impressions of various characters and Japanese celebrities, such as comedian Rakutarō Sanyūtei and baseball player Eiji Bandō.


  • Hime and Bossun holding hands
    Himeko: His relationship with Himeko is complicated - they aren't lovers, but undeniably more than friends. In the 'School Trip Rhapsody' arc, Bossun even says himself that he has never thought about his feelings towards Himeko, though he later said "until now". At one point, when he suspects that Himeko is dating Katō, he becomes irritated whenever he sees them together. He is like his father who referred to Haru as a friend. In one scene where Yusuke talks to Chuma about Remi's love, he thinks back to Himeko and him sleeping in the futon together. And in the Trouble Travel arc where Himeko was captured, he noticed that everytime Himeko was in danger, he'd always lose his "cool" and went berserk though he did not yet realize anything at that time. In other hand, as noted by Switch, Bossun and Himeko are unseparated bokke and tsukkomi partner.
  • Roman Saotome: Due to her Otome Filter, Roman falls in love with Bossun from first sight without actually knowing it was him. After Bossun saves her from being hit by a trunk, Roman is forever smitten by Bossun who she calls, "my prince."
  • Saaya Agata: At first, Saaya abuses Bossun verbally due to her inability to deal with boys. Bossun helps Saaya out with her tsundere problem, and during this time, she begins developing romantic feelings for him. Bossun remains oblivious to Saaya until the School Trip Rhapsody arc, and when Himeko asked him of what he thought of Saaya, he said that she was only just a friend to him. Though, she eventually confessed to him, but Bossun is not interested in a romance.
  • Sasuke Tsubaki: They view each other as rivals and end up fighting or arguing whenever they meet. Despite this, they do have some brotherly moments and, as others have noted, they are actually more alike than they'd admit. Since discovering their relationship as twins, they are more apt to asking each other for advice or assistance, but they usually require a push from their respective club/council members.


  • Shinohara states that Bossun's surname is a combination of the character "fuji" (藤) from Fujiko F. Fujio and the character "saki" (崎) from Hayao Miyazaki. His first name comes from the musician Yūsuke Chiba.
  • Bossun's hat, given by Himeko is from their (his and Himeko) favorite anime "Poppman" while his goggles was given by Switch, is from their (his and Switch) favorite robot anime.
  • Bossun is right-handed and the first kanji of his name consists of the radical 右, which means "right."
  • In episode 60, Bossun states that he has no problem with his grades since he's good at memorizing except for math.
  • Bossun appeared in Beelzebub chapter 69 along with Switch. (Page 3, panel 2 from top).
  • During the Quiz Society's Battle Q, where the Student Council were forced to participate, Bossun makes a guest appearance under the alias "Bosshuuton" which literally means "incorrect" in Japanese.


  • To Himeko: "I would never betray a friend. So who the hell cares if somebody betrayed you once, huh?!! I'm not like that!" [1]
  • To Akane: "I'm alive through the help of a lot of people. I'm here now because you're here, mother. I'm glad you became my parent. I'm really lucky."[2]


  1. Sket Dance. Episode 37
  2. Sket Dance. Episode 47
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