TV-Series
Description
In the anime Fate/Extra Last Encore, the Servant summoned in the Berserker class is a powerful and disciplined martial artist whose true identity is Li Shuwen, the renowned Chinese master of Bajiquan and Liuhequan from the early 20th century. Unlike the common perception of the Berserker class as a raging, mindless beast, this incarnation of Li Shuwen is characterized by a calm and focused demeanor, honed by a lifetime of rigorous martial training. His madness is not one of uncontrolled fury but manifests as a deep, unwavering fixation on combat, reducing his personality to that of a living weapon whose sole purpose is to test his skills against worthy opponents.

His background is that of a legendary figure in martial arts history, famous for the principle of "no second strike," meaning his attacks were so precise and devastating that a single blow was always sufficient to kill. This core tenet defines his entire approach to being a Servant. His motivation is not born from a wish on the Holy Grail, but from the pure, distilled desire of a martial artist to engage in ultimate combat. He seeks to land that one perfect, decisive blow, and his presence on the battlefield is driven by this singular, almost serene pursuit of martial perfection.

In the narrative of Last Encore, Berserker serves as a primary enforcer for his Master, Julius Belkisk Harwey, on the fifth floor of the Moon Cell's lunar labyrinth. Julius is a former champion of a previous Holy Grail War who, after being defeated and deleted, used his exceptional hacking skills to avoid total erasure, resulting in a corrupted, half-dead state. Berserker himself is a reflection of this corruption; originally summoned as an Assassin in the previous war, he was transformed into a Berserker due to the circumstances of his Master's unnatural revival, trading stealth for raw, concentrated destructive power. The pair acts as a deadly obstacle, with Julius harboring a personal vendetta against the protagonist, Hakuno Kishinami, and his Saber, Nero.

The key relationship is with his Master, Julius. While their bond is not one of friendship, it is a symbiotic pairing of mutual utility. Julius provides the mana and orders, while Berserker executes with lethal efficiency. There is little dialogue exchanged between them, as Berserker operates as a silent and obedient instrument of Julius's will, highlighting his nature as a tool for battle above all else. His role in the story is that of a fearsome rival, a testament to the brutal history of the previous war and a physical representation of the cycle of hatred and undeath that now plagues the Moon Cell.

In terms of development, Berserker remains a static but formidable force. His character is defined by his already completed legend; he does not undergo a personal transformation. Instead, his impact on the story comes from the revelation of his identity and the tragic circumstances of his summoning. He is a mirror to the protagonist, showing what a Servant-Master pair can become when driven by revenge and stagnation rather than a wish for the future. His defeat is a direct result of his Master's vulnerabilities, underscoring that even a perfect weapon can be undone by the weakness of its wielder.

His notable abilities are a terrifying reflection of his martial mastery. His primary Noble Phantasm is No Second Strike, which embodies his lifelong principle of ending a fight in a single exchange. Any successful blow from his fists has a high probability of being instantly fatal, bypassing conventional durability. His skill with the spear is also legendary, but as a Berserker, he focuses almost exclusively on his unarmed techniques, which are compressed into a fearsome style that can shatter defenses and land killing blows with minimal motion. Despite the Mad Enhancement of his class, his skills are not wild; they are controlled, precise, and overwhelmingly powerful, making him one of the most dangerous close-combat opponents in the series. He is a master of five different Servant classes, but as a Berserker, his power is amplified at the cost of the tactical flexibility he once possessed as an Assassin.