Fist of the North Star series. 5: Kankichi Ryotsu , a lazy, undisciplined police officer who somehow possesses superhuman strength. 6: Astro Boy from the Astro Boy franchise. 7: Son Gohan , son of Son Goku. 8: Duke Togo a.k.a. Golgo 13 , the most deadly professional assassin. 9: Monkey D. Luffy