TV-Series
Description
Seijūrō Hiko is the thirteenth successor of the Hiten Mitsurugi-ryū swordsmanship style, a title that requires discarding one's original name. His lineage traces back to the style's founder during the Sengoku period, though he lives in Japan's Meiji era. He discovered the orphan Shinta amidst bandit violence that claimed the child's companions. Impressed by Shinta's courage and compassion, Hiko rescued him, renamed him Kenshin ("Heart of Sword"), and took him as his sole disciple and unofficial adopted son. They trained in isolation on a mountain near Kyoto, but their relationship fractured when Kenshin abandoned his training to join the revolution against the Tokugawa regime, leading Hiko to live reclusively as a pottery artist.

Hiko possesses a tall, muscular build with a youthful appearance despite being 43 years old. He has long jet-black hair typically tied in a ponytail and is considered exceptionally handsome. His attire includes a short-sleeved gi (red in manga, blue in anime), black hakama pants tucked into boots, and a distinctive ankle-length white cloak with red lining. This cloak, an heirloom of Hiten Mitsurugi-ryū, weighs approximately 90 kilograms due to heavy materials and counter-springs in the shoulders. It functions as a training device to maintain his strength and control the style's power during peacetime, its design drawing inspiration from Todd McFarlane's Spawn comics, particularly the exaggerated collar.

He displays a brusque, sarcastic, and egotistical personality, often calling Kenshin "my idiot apprentice" and recounting embarrassing incidents from Kenshin's past to provoke him during training. He is openly misanthropic, disliking social complexities and societal issues which he finds depressing. To avoid human interaction, he sustains himself through pottery, a craft he excels at. He exhibits laziness and narcissism, admitting he retrained Kenshin primarily to avoid dealing with threats like Shishio Makoto himself. Despite this, he harbors a deep sense of responsibility toward Kenshin and those under his protection, complying with requests to safeguard Kenshin's friends despite vocal complaints. He enjoys sake and teasing Kenshin, frequently engaging in slapstick conflicts. His philosophy dictates that Hiten Mitsurugi-ryū must remain independent from political powers and solely used to protect people from suffering. He demonstrates profound insight and wisdom, accurately predicting Kenshin's psychological turmoil during the revolution and identifying the despair of opponents like Fuji, whom he helped overcome by offering respectful combat. Unlike Kenshin, he shows no reluctance to kill enemies, as seen when slaughtering bandits, though he spared Fuji by reversing his sword to use the dull edge.

As the most powerful fighter in the series, Hiko's abilities vastly surpass all others, including Kenshin. His true capabilities are suppressed by his 90-kilogram cloak; without it, his speed and strength reach superhuman levels. He achieves "godspeed" movement without preparatory steps and executes the Hiten Mitsurugi-ryū's ultimate technique, the Hiten Mugen Zan, unleashing imperceptibly fast slashes that devastate the terrain. His physical conditioning allows him to wield the style at maximum output indefinitely without bodily damage, a feat impossible for lesser practitioners like Kenshin. He combines analytical precision with versatile combat skills, wielding his sword in multiple stances or barehanded to launch opponents with forceful strikes. His combat zone, or "ma'ai," is described as an impermeable barrier where entry guarantees instant defeat. His only acknowledged weakness is the potential for his strength to attract greater conflicts, reinforcing his neutrality unless directly necessary. He often arrives too late to prevent tragedies, reflecting his "bad luck" in timing interventions.

During the Kyoto Disturbance arc, Hiko reluctantly intervenes when Kenshin seeks training to defeat Shishio. He initially refuses, criticizing Kenshin's self-sacrificing mentality, but accepts after Kenshin demonstrates a renewed will to live. Their training culminates in Kenshin mastering the Amakakeru Ryū no Hirameki, the style's final technique. Hiko later aids Kenshin's allies against Shishio's forces, notably defeating the giant Fuji by recognizing his inner turmoil and granting him a dignified battle. Years later, he visits Kenshin and Kaoru's son Kenji, displaying unexpected tenderness while holding the infant, contrasting his typically aloof demeanor. He muses that the Hiten Mitsurugi-ryū may become irrelevant in the modernizing world, symbolized by his observation that "the only thing that doesn't change is the moon".