PHHeroes and villains are two sides of the same coin... I can see it in that glare of yours. So what is it that really makes someone a hero?
Tsunagu Hakamata (
Tsunagu is a tall man with dark eyes and blonde hair combed into a side-part. In his hero costume, the majority of Best Jeanist's body is clad in denim. He has the waist of jeans shaped into a cylinder to covers his mouth and a jean jacket with sleeves. Best Jeanist finishes his outfit with a pair of jeans and brown boots. As shown on several occasions, he has unnaturally long and flexible neck.
Tsunagu is an elegant man with flamboyant tendencies. He believes very strongly that people with influence maintain a positive appearance both physically and socially. Best Jeanist often uses metaphors referencing jeans or denim. He often inspires his recruits with speeches by telling them to keep their life straight like their jeans. 
Best Jeanist takes on the role of being a hero very seriously. He is selfless, brave, and charismatic. Best Jeanist aims to spread a sense of a peace to all people and believes hero's don't make excuses. He did not hesitate to take the full brunt of All For One's attack to save his allies, something the latter later praised him for.
Some time ago, Best Jeanist was called into a meeting with Eraserhead, Manual, Death Arms, Snipe, Thirteen, Endeavor, Air Jet, Midnight, Ingenium, Gunhead and a member of the police force to speak about the unwilling civilians injected with Trigger.
When Katsuki Bakugo chooses him for an internship, Tsunagu introduces himself by admitting he does not like Katsuki very much. Irritated, Katsuki replies that Best Jeanist sent the offer to him. Tsunagu says all his other recruits were well behaved unlike him. Although Tsunagu admits that Katsuki is an outstanding talent, he says the young man still needs to be taught how to display himself as a hero. Irritated Katsuki approaches Tsunagu, forcing him to discipline Katsuki by using his Quirk to wrap him in denim.
The next day, Tsunagu tries to teach Katsuki the value of maintaining an elegant outward appearance. Best Jeanist styles Katsuki's hair similarly to his own, but it returns to its messy form shortly after.
After Hero Killer: Stain's defeat is published, Best Jeanist reminds Katsuki and all his sidekicks to remain calm and operate as they normally would. Later on, Tsunagu takes Katsuki on patrol. He asks Katsuki why patrols are important, to which his intern answers is because they can beat up criminals on sight. Tsunagu says this answer is wrong, and that patrols help heroes maintain a strong public image. Katsuki ends up getting into a spat with young children, making Tsunagu comment about Katsuki's pride.League of Villains' Vanguard Action Squad, Tsunagu is enlisted to help in the rescue operation to save Katsuki. Best Jeanist, Endeavor, Edgeshot, and All Might are present and ready to begin the strategy meeting. Before the infiltration begins, Best Jeanist mulls over his inability to help change Katsuki's attitude and attributes it to his pride.
Mt. Lady destroys the front of the warehouse and she, Tiger, Best Jeanist, and Gang Orca infiltrate the partially destroyed warehouse and apprehend all the Nomus while Tiger rescues Ragdoll. Best Jeanist notes that the warehouse has been cleared. Best Jeanist orders the Police Force to come in and hold position in case there are more Nomus around. Suddenly, All For One appears and reveals that he stole Ragdoll's Quirk. Best Jeanist restrains the villain with his Quirk, but before he can act further, the warehouse is completely destroyed and the surrounding area suffers damage.
Best Jeanist managed to react quickly and used his Quirk to manipulate the clothes of his fellow pro heroes and reeled them backwards, which allowed them to survive All For One's attack. However, Mt. Lady, Tiger, and Gang Orca are heavily injured while Best Jeanist himself is also heavily injured but conscious. All For One praises Best Jeanist for his quick thinking; Best Jeanist attempts to use his Quirk to attack All For One, but All For One impales him from afar which knocks out Best Jeanist. Kamui Woods later rescues Best Jeanist.
The in second annual of the Hero Billboard Chart JP, Best Jeanist appears on stage, where the announcer reveals he is taking a rest from his duties as a Hero for an extended amount of time. It is also revealed he has climbed to from No. 4 to the No. 3 spot due to his participation in the Kamino Ward Hideout Raid.
Quirk and Abilities
Fiber Master (ファイバーマスター Faibā Masutā?): Tsunagu can manipulate fibers at will as long as the person is wearing clothes. He can unravel a part of his clothes into fabric strings and can use them to restrain targets, as shown when he apprehends the League of Villains' Nomus. This Quirk works better on denim rather than sweats. This is a powerful ability that catches most off guard. He can manipulate his threads to move very fast, far, thin enough to be nearly invisible, and strong enough to easily bind even Nomus. It is a prime example of a restraint type ability.
Enhanced Durability: Tsunagu was able to take a direct hit from All For One's attack and remain conscious, albeit taking heavy injuries.
- His name contains the kanji for "hakama" (袴?), "field" (田?), and a component of the word "fiber" (維?).
- His given name is homophonous with the verb "to tie or fasten".
- Best Jeanist's favorite animal is the wolf.
- In series, Best Jeanist leads the fashion world with huge popularity among both young and middle-aged men.
- (To Katsuki Bakugo) "Heroes and villains are two sides of the same coin... I can see it in that glare of yours. So what is it that really makes someone a hero?"