Yuuichirou Hanma
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Yuuichirou Hanma, is the father of Yuujirou Hanma and grandfather of Jack Hanma and Baki Hanma. He is the only other person aside from Yuujirou to defeat the USA on a small island in the Okinawa territory during WW2. He is also known for defeating 2,000 US soldiers using one technique.
(Source: Baki Wiki)
