heart

Heart is one of the Four Chief Vassals of the King Organization led by Shin, along with Spade, Diamond, and Club. A hulking fat man, Heart's stomach was composed of a rubber-like substance which absorbs the impact of most martial art techniques, earning him the nickname The Destroyer of Fists (拳法殺し Kenpō Koroshi). It was said that only Nanto Seiken was capable of defeating him through brute force.
While normally calm and more merciful than his fellow Kingsmen, his personality changes to that of a homicidal maniac at the sight of his own blood, such as when he murdered several of his own men and a bartender after pricking his hand on a shard of broken glass.
Heart fought Kenshiro within Shin's palace at Southern Cross as the last of the Four Lieutenants. Heart would normally be immune to the effects of Hokuto Shin Ken, but using the Hokuto Jūha Zan technique, Kenshiro was able to penetrate Heart's flesh and cause his body to explode. His iconic death cry was "HIDEBU", a corruption of Iteyo ("It hurts").