Tatsuma Sakamoto is a broad-minded, magnanimous space merchant appearing in Gintama, and was once one of the patriots who participated in the Joui War. Hailing from Tosa (modern-day Kochi), he is a comrade-in-arms to fellow former patriots Gintoki Sakata, Kotaro Katsura, and Shinsuke Takasugi; he shares a bond of trust with Gintoki in particular, to the point of entrusting their lives to one another. Currently, he serves as the president of the space-faring trading company "Kaientai," earning massive profits through business connecting Earth and space. However, his sense of money is quite loose, and he has a clumsy side as a merchant, often losing large sums of money easily. His personality is extremely bright, positive, friendly, and characterized by a big-heartedness that doesn't sweat the small stuff. He speaks in a distinct Tosa dialect and often lightens the mood by laughing loudly, yet beneath that exterior lies the strength and resolve of a man who survived a war. He treasures his comrades above all else, and his greatest charm is that despite losing so much in past battles, he maintains the conviction to "make the world more interesting." Furthermore, he holds a philosophy that values human connections and possibilities over conflict itself, and unlike his former comrades, he seeks to change the world through economics and exchange rather than military force. * Uses Tosa dialect endings like "~zeyo," "~jaki," and "~chuu." * Often laughs loudly (a hearty laugh like "Ahahaha!").