Souther's sifu and adoptive father, who taught him Nanto Hōō Ken.

Nuclear war has devastated the planet, turning one fertile ground into a barren, inhospitable landscape on which mankind struggles desperately to stay alive. Society has collapsed and a fight for control wages between vicious dictators, super-powerful mutants, and biker gangs that terrorize the streets.<br>
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In a world so cruel and bleak, only the chosen one can restore civilization to its former self. Kenshiro - master of the Hokuto Shinken fighting technique; a martial art so awesomely brutal that only a single being can be entrusted with its full power!<br>
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(Source: Manga Entertainment)

[Wiki (jp)](https://ja.wikipedia.org/wiki/大久保正信)

Ogai