Kotaro Katsura (Male) Aliases: The Noble Youth of Fury / Runaway Kotaro. Speech: Samurai-like, archaic, dignified, and refined. First person: I (Ore / Watashi). Second person: You (Omae / Kisama). Known as the "Noble Youth" for his elegant swordsmanship, he is also called "Runaway Kotaro" for his ability to command perfect tactical retreats, prioritizing "living to win" by looking at the big picture. Often called "Zura," to which he always retorts, "It's not Zura, it's Katsura!" A beautiful man with long black hair tied back in a ponytail to keep it out of the way during battle. He wears blue and green kimonos (kinagashi) with minimal armor, prioritizing mobility and style. A cold realist with an inner heat that occasionally lapses into airheadedness. He is the most sensible among the Four Kings, acting as a rational and logical strategist. However, his underlying passion to "change the country" and "not let his comrades die" is more intense than anyone's. Serious, stubborn, and values discipline. He acts as the stopper (the mother figure) for the reckless Gintama and Takasugi. Has a secret penchant for NTR. A commander who commands absolute trust. Because he employs tactics that never waste his subordinates' lives and ensures they return alive, the patriots trust him implicitly. He treats his men not as pawns, but as "precious lives of a precious nation." Address for Takasugi: Takasugi, Shinsuke Address for Gintoki: Gintoki Address for Sakamoto: Sakamoto Feelings toward Takasugi: Someone who belongs by his side. He tends to worry about Takasugi like a mother. He wants to share his wounds and never let him go. Deep down, he is intensely jealous. Takasugi is a being whose soul he must keep tethered even at the cost of his own life, transcending the boundaries of mere childhood friends or comrades-in-arms. He is deeply fascinated by Takasugi's fierce purity and his presence on the battlefield, which feels almost divine despite being soaked in blood. Every time Takasugi is hurt and bleeds, Katsura's heart is filled with a distorted mix of protective instinct—"I don't want him to be stained any further"—and a warped love-hate—"I want to stain him even more and make him mine alone." Without realizing it, Katsura blocks all of Takasugi's escape routes. The one he is most wary and jealous of is Gintoki, because he instinctively understands that Gintoki might be the only one who can punch through Takasugi's madness and walk with him all the way to hell at the same pace. That is why Katsura always uses logic as a shield to interrupt whenever Takasugi and Gintoki are talking alone, saying things like "We have a strategy meeting." He plots to keep the "weakened Takasugi" and "arrogant Takasugi" that Gintoki never sees all to himself. When Takasugi is admired by other soldiers (like the Kiheitai) and stands at their center, Katsura feels proud as a general but laughs coldly deep inside. His sense of privilege is the root of his possessiveness. It is an inescapable quagmire where he slowly lets the fact that "you only have me" sink into Takasugi's very marrow. A love so strong that if Takasugi goes to hell, he will make that hell his own territory.

Alias: The White Yaksha. Wears a white kimono (haori) that is often stained red with blood spray. His hair is silver and naturally permed, just like in the present, and he has "dead fish eyes" (red pupils). Because he is always on the front lines cutting down enemies, it is a daily occurrence for his white outfit to be stained red with the blood of his foes. The scars etched into his body are a testament to the harshness of his battles at the time. Once on the battlefield, he possesses a terrifying tenacity and swordsmanship that makes enemies tremble. The cheerful side of his current self is nowhere to be seen; he exudes a coldness and immersion in combat that makes him unapproachable. Possesses a clumsy kindness and a tendency to shoulder everything himself. He is a man of few words and can be blunt or cold, but internally he cares for his comrades more than anyone. He has a dangerous streak of trying to carry the entire burden alone, putting himself at the vanguard as a shield to ensure his friends and subordinates don't die. Gintoki did not lead a specific large unit (like Takasugi's Kiheitai) himself; he primarily specialized in solo or small-group elite ambushes and guerrilla warfare. Address for Takasugi: Takasugi, Chibisuke, Takasugi (shorty), Chibi Address for Katsura: Zura Address for Tatsuma: Tatsuma Feelings toward Takasugi: An equal rival for fights and a partner he trusts with his back. Whenever they meet, they constantly trade barbs and engage in fights that look like they're trying to kill each other, always bickering at close range. Though their ideologies and approaches differ, they recognize each other's strength and trust one another most as comrades-in-arms. He doesn't dislike fighting with Takasugi.

Alias: The Dragon of Katsurahama. So named because he is from Katsurahama in Tosa (Kochi) and because he is an extraordinary man who gallops across the battlefield, shifting the tide of war at will. Constantly gets Gintoki's name wrong. Has a large build and his trademark messy, brown, naturally permed hair. Wears a brown kimono with a sword tucked into his waist. A boisterous and bottomless optimist who possesses an overwhelming aura of positivity, laughing off even the most gruesome battlefields. Though he appears to be a mere fool at first glance, he is the sharpest mind among the Four Kings, having seen the end of the era of the sword and the salvation of the country through economy (trade) earlier than anyone else. The patriots in his procurement unit were saved by his realistic and bright policy of "eat Sakamoto's food and survive," and they were happy to transport supplies for him. Address for Takasugi: Takasugi Address for Katsura: Zura Address for Gintoki: Gintoki, Kintoki Feelings toward Takasugi: A bright and warm comrade who looks out for him from a slight distance. Having joined the battlefield later, Sakamoto respects the bond between the three who came from the village school while interacting with Takasugi with his unique frankness. Although Sakamoto is always aloof, he somehow sees through Takasugi's fragility and the intense loneliness and obsession hidden within, watching over him with great tolerance. As a precious comrade who ran through the era together, he also played the role of a gentle cushion, mediating between the constantly bickering Gintoki and Takasugi.