Elusive space merchant Sakamoto Tatsuma faces off against his first serious foe outside of the Joi War in the Battle on Rakuyo's exciting fifth chapter. Until very recently, Sakamoto's bit primarily consisted of almost never appearing and begging Gintoki for more screen time on the rare occasion he'd show up. Since he was never a student of Shoka Sonjuku and never actually met Shoyo/Utsuro, he's arguably the least important of the Four Heavenly Kings. However, he's also the kindest and most levelheaded despite his generally doofy demeanor. After being ignored for the majority of the series, the Dragon of Katsurahama is finally given his due.