Gintoki Sakata stands as the central figure of his narrative, a man whose past as a fearsome warrior sharply contrasts with his present-day identity as a lazy, sweet-toothed freelancer. In the events of the final movie, he carries the weight of a lifetime of loss and impossible choices, facing the ultimate confrontation with the darkness that has haunted him since his youth.

Gintoki was once a legendary samurai known as the Shiroyasha, or White Demon, a nickname earned during the Joui War for his ferocious fighting style, his silver hair, and the white clothing he wore into battle. His origins, however, were far more desperate; as a nameless child scavenging battlefields for food and weapons, he was found by a teacher named Yoshida Shouyou. Shouyou took him in, gave him his first sword, and became his mentor at Shoka Sonjuku, where Gintoki learned the way of the samurai alongside his future comrades, Kotarou Katsura and Shinsuke Takasugi. This period of his life ended in tragedy when Shouyou was arrested. Joining the war to rescue him, Gintoki was eventually forced into an impossible situation: to save the lives of Katsura and Takasugi, he had to personally execute his beloved teacher. This traumatic event, carried out while fulfilling a promise to protect his friends, shattered their bond and has defined his internal world ever since.

In the present day, Gintoki presents the image of a man who has retreated from that violent past. He runs a small, struggling odd-jobs business called the Yorozuya out of a second-floor room in the Kabukicho district. His defining traits are a profound laziness, an insatiable and medically inadvisable craving for sweets, a perpetual lack of money due to gambling on pachinko, and a habit of reading Shonen Jump magazine instead of working. He is sarcastic, seems cowardly in the face of ghosts or the dentist, and is frequently seen with a blank expression. Despite this comical exterior, Gintoki lives by a deeply personal samurai code. He is unfailingly loyal to the found family he has built with Shinpachi Shimura and the superhuman alien girl Kagura, and he will go to any length to protect them and the people of his neighborhood.

His role in the final movie is the culmination of his entire journey. He fights alongside his former friends and rivals, including the now-reformed Takasugi, to confront Utsuro, the immortal and nihilistic original personality of his beloved teacher, Shouyou. This enemy represents the ultimate legacy of his past trauma, and the conflict forces Gintoki to finally put his old ghosts to rest. Key to this final battle are the relationships he has forged. His bond with his Yorozuya companions, Shinpachi and Kagura, is his anchor and his source of strength, having grown from a business arrangement into a genuine family. The bitter enmity with his former friend Takasugi, born from the trauma of their teacher's death, is brought to a head and eventually resolved, allowing them to fight as comrades once more. His connection to his landlady, Otose, who gave him a reason to live when he was at his lowest, is one of deep, unspoken gratitude, and he sees protecting her and her husband's memory as a sacred duty.

Throughout the series and into the film, Gintoki demonstrates notable, almost superhuman abilities. His primary weapon is a simple bokuto, or wooden sword, which he calls Lake Toya. Despite its material, he wields it with such incredible strength and skill that he can cut through metal, deflect energy beams, and defeat legendary warriors. His swordsmanship style is described as wild and unrefined but brutally effective, a reflection of his pragmatic and unpredictable nature. His true strength, however, is his unbreakable will and tenacity. He never gives up on protecting what he values, acting not out of a grand ideology but from a simple, personal desire to keep the people he loves safe. This combination of a tragic past, a ridiculous present, and an unshakeable core of loyalty is what defines Gintoki Sakata as he faces his final, greatest challenge.