北斗神拳
represents the Star of . The Star of Leadership rules over the Nanto constellation; therefore, none of the other Nanto successors can defeat him. He fights with the style; the ultimate form of Nanto Seiken. This freeform style typically has no stances and instead focuses on incredible speed and power. However, there is one stance which is only reserved for when facing a worthy opponent — . Similar to Hokuto Shinken, this style is taught in the ways of Isshi Sōden(), meaning there can be only one master and one successor. The student must kill his master in order to complete his training. Souther is immune to most "Hokuto Shinken" techniques thanks to his "Emperor's Armor" (his organs and pressure points are reversed). Souther was orphaned as an infant and was raised by the previous "Hō-ōken" successor, Ogai, who trained him during childhood, sparring with Raoh at the time. During his final training lesson, Souther unwillingly killed his sensei, who intentionally allowed himself to be killed by Souther, as the final test. Traumatized by the event, Thouzer disavowed all feelings of love and compassion. After the Nuclear War, he takes on the title of and enslaves children with his army in order to construct the Holy Cross Mausoleum, a shrine to his deceased sensei. During the events of "Ten no Haō", Souther battled Raoh before the two entered into a temporary ceasefire. Later, after his first fight with Souther, Kenshiro learns the secret of Souther's immunity and is able to defeat him. Souther uses his last breaths to reconcile with his emotions.