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One of the recurring character of Grappler Baki. Also known as "Jack Hammer" in the early romanization.
Jack Hanma is the first offspring of Hanma Yujiro born to a Canadian mother Diana Neil, after Yujiro raped Diana during his time as a mercenary after he found out that Diana was sent as a spy by the United States to kill him. Since his youth, Jack swore to kill Yujiro in combat to revenge his mother for the trauma Yujiro has caused. To this end, Jack fanatically trains to become stronger while disregarding anything he deems "unneccessary" such as eating or bathing, to the point that his body became bone-tight skinny and that he could only move by his sheer will to live. Noticing his determination, an American scientist offered a "super steroid" that massively increase his muscle mass, allowed him to endure the rigorous training he partaked.
While generally reserved and quiet outside of the fight, Jack is a ferocious fighter that will do any means neccessary to obtain more strength and win, even if it means shortening his lifespan. He regularly takes bottles of steroids and stimuli as a part of his training (to which he was able to endure the side effect due to his "Hanma blood"), and has multiple body modification surgery to increase his stature. He is best known within the series for inventing "Goudou", a "fighting style of the weak" consisting of biting the opponent on the critical parts of their body to defeat them.
The following tags are aliased to this tag: jack_hammer (learn more).