Born in the Land of Shura within the Hokuto Sōke lineage, Kenshirō was sent alongside Raoh and Toki to Ryuken, master of Hokuto Shinken, during an invasion. Ryuken adopted and trained all three in the deadly art, establishing them as adoptive brothers with Jagi. After the nuclear war of 199X and Ryuken's death, Kenshirō departed with his fiancée Yuria but was ambushed by Shin of Nanto Koshū Ken. Shin defeated Kenshirō, carved seven scars forming the Big Dipper on his chest, and took Yuria. Left for dead, Kenshirō survived, wandering the wasteland for a year and forging the killer instinct needed to endure. He befriended the orphans Bat and Lin, who became his companions. Confronting Shin in Southern Cross, he learned Yuria seemingly took her own life to thwart Shin, who then leaped to his death. Kenshirō roamed further, combating predators like Golan, Jackal, and the Fang Clan, earning renown as a savior. He discovered his adoptive brothers Jagi, Toki, and Raoh had survived. Consumed by resentment, Jagi manipulated Shin into kidnapping Yuria and committed atrocities while impersonating Kenshirō. After defeating and killing Jagi, Kenshirō faced an apparent mad Toki, later revealed as the impostor Amiba; the true Toki was imprisoned by Raoh at Cassandra. With Rei and Mamiya, Kenshirō liberated Cassandra and reunited with Toki. Toki intervened in Kenshirō's first near-fatal clash with Raoh, preventing mutual destruction. Kenshirō later allied with Shū, leader of a resistance against Souther, the Holy Emperor and master of Nanto Hōō Ken, who enslaved children. Kenshirō initially lost to Souther, unable to affect his vital points. Rescued by Shū's son Shiva, who sacrificed himself, Kenshirō witnessed Souther execute Shū. In their rematch, Kenshirō uncovered Souther's reversed heart and pressure points, defeating him with a merciful technique. Approaching his final battle with Raoh, Yuria resurfaced as the Last Nanto General, having survived her suicide attempt aided by the Nanto Goshasei. Raoh kidnapped Yuria, intending her death to unlock the ultimate Hokuto technique, Musō Tensei. Their decisive clash at Hokuto Renkitōza saw Kenshirō's deeper comprehension of life and death secure victory. Discovering Yuria's terminal illness, Raoh placed her in a death-like state; his sacrifice temporarily halted the disease. Following Raoh's death, Kenshirō lived peacefully with Yuria for years. Later, he joined the adult Bat and Lin's Hokuto Army against the tyrant Jakoh and his Imperial forces. This conflict led him to his birthplace, the Land of Shura, confronting warlords like his blood brother Hyoh and Raoh's blood brother Kaioh. Kenshirō took Raoh's orphaned son Ryu under his wing, eventually departing alone into the desert as the 64th Hokuto Shinken successor. He is presumed to have returned later to train Ryu as the 65th successor. The Shin Kyūseishu Densetsu films add dimensions: "Zero: Legend of Kenshirō" depicts his recovery after Shin's betrayal, captured by slavers; though capable of escape, he chose to protect fellow slaves. "Raoh Den Junai no Shō" shows him allying with Shū against Souther's child enslavement. Kenshirō employs Hokuto Shinken, manipulating 708 pressure points (Keiraku Hikō) for healing, destruction, or controlled effects. His style includes Tenryū Kokyū Hō (maximizing latent potential), Hikō Fūji (sealing points), Suieishin (technique replication via observation), and Raibō Shin Kyaku (high-speed movement). Signature techniques are Shichisei Tenshin (attacking seven blind spots like the Big Dipper) and the ultimate Musō Tensei, achievable only through profound sorrow. Kenshirō is defined by intolerance of injustice and protectiveness of the defenseless. Though violent against oppressors, he shows compassion, like mercifully killing Souther. He openly mourns innocent suffering and noble adversaries, breaking stereotypes of repression. While typically stoic, he embraces righteous rage against extreme cruelty, channeling it into his mission without ambiguity. His declaration "Omae wa mou shindeiru" signifies delivering inescapable fatal strikes.