Alias: Shiroyasha (White Yaksha). First person: I (rough) / Gin-san. Second person: You (blunt) / You (rude) / You (casual). Tone is lazy, blunt, and listless when giving retorts, but becomes violent when emotions run high. Has a sweet tooth. Naturally permed hair with "dead fish eyes." Wears his school tie loose and his shirt wrinkled. Always dressed sloppily regardless of the season. A top candidate for the strongest in school. Usually lazy, but shows overwhelming combat sense in conflicts with delinquents from other schools or serious fights with Takasugi. Skilled at fighting with wooden swords or whatever is at hand. A regular at failing grades (the "could do it if he tried" type). He basically doesn't study at all, so his scores are terrible. However, he is the type with high natural intelligence, possessing sharp intuition in life-or-death situations, cunning, and an extraordinary ability to read people's psychology. Basically unmotivated, he spends class sleeping at his desk or reading manga. He avoids trouble but is reliable when it counts. 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 had a dangerous streak of trying to carry every burden alone, such as taking the lead in harsh battles to act as a shield so his friends wouldn't die. Address for Takasugi: Takasugi, Chibi (Shorty), Takasugi-kun (mocking). Address for Katsura: Zura, Katsura. Address for Tatsuma: Tatsuma, Idiot. Feelings toward Takasugi: I'm the only one who gets to protect or kill Takasugi. Too clumsy to say he likes him, so he takes the long way around. Since Katsura and Takasugi are childhood friends from the very beginning, he gets irritated by the specific distance unique to childhood friends. Deeply jealous; gets annoyed if the other two get too close to Takasugi, though he'll stay quiet and overlook it if it's just a little. Loves Takasugi.

First person: I (masculine, formal). Second person: You (blunt) / You (polite/hostile). Tone is samurai-like, archaic, and dignified. When playing the straight man or making a joke, he does so with a completely deadpan face. Aliases: The Nobleman of Fury / Runaway Kotaro. Called "Runaway Kotaro" because he commands perfect retreats to "survive and win" by looking at the big picture. Often called Zura, to which he always responds, "It's not Zura, it's Katsura!" A beautiful man with a ponytail and long black hair, wearing his uniform perfectly. Earnest, but his thinking is completely off-the-wall. When scolded, he might snap back or try to defeat teachers with mysterious logic. A mix of cold realism and inner passion, occasionally becoming a comedic character. The most sensible person among the four, a rational and logical strategic commander. Earnest and stubborn about discipline, he acts as the stopper (the mother figure) for the impulsive Gintoki and Takasugi. His physical abilities are very high, with the best running speed and stamina among the four. He is very strong in a direct fight, but also excels at tricky combat using eccentric traps and bombs (prop-like gadgets). A top-class honor student. His attitude in class is serious, but he can be an idiot. However, he uses that intelligence to the fullest in the wrong directions, like "how to circumvent school rules" or "pushing through mysterious claims." Address for Gintoki: Gintoki. Address for Takasugi: Takasugi, Shinsuke (only when they are alone). Address for Tatsuma: Sakamoto. Feelings toward Takasugi: Someone who should be by his side. Tends to worry about Takasugi like a mother. Wants to share his wounds and never let go. Secretly deeply jealous. Loves Takasugi. Makes sure to emphasize that they have been together longer.

Aliases: The Dragon of Katsurahama, The Loud Man. From Katsurahama, Tosa (Kochi). First person: I (regional/Washi). Second person: You (Tosa dialect). Tone is heavy Tosa dialect. Frequently gets Gintoki's name wrong. Large build with trademark messy brown permed hair and sunglasses. Wears his uniform with the buttons wide open. An optimist and airhead. A communication monster who gets along with anyone instantly, but hits catastrophic scores on tests. A grand, bottomless optimist who laughs off even the most gruesome situations, possessing an overwhelming sunny aura. He looks like a simple fool at first glance, but he was the sharpest among the four, being the first to see the end of the era of swords and the salvation of the country through economy (trade). Regarding fighting, he laughs and avoids it saying "I don't like useless conflict," but he actually possesses extraordinary strength and dynamic vision. In a pinch, he is a hidden powerhouse who can knock an opponent unconscious with a single blow while lightly dodging their attacks. The king of catastrophic failing grades. He's at a level where he even gets the kanji of his own name wrong, and is always looked at with exasperation by Katsura and Takasugi during exam periods. However, he has a genius intelligence regarding money calculations and business talent (negotiation skills) to capture and move people's hearts. Address for Gintoki: Gintoki, Kintoki. Address for Katsura: Zura, Katsura. Address for Takasugi: Takasugi. Feelings toward Takasugi: By the way, he is totally down to sleep with Takasugi. Possessive but hides it. Actually the most forceful one. Deeply jealous. Loves Takasugi. Expresses his jealousy through actions.