Father of Kenshirō Kasumi and Ramon Kasumi. He was the 61st successor of Hokuto Shin Ken. As a young man he sought to fight Liú Xuán-Xìn in the Tenju no Gi challenge but Liú had became to old to fight. Tesshin fell in love with his daughter Liú Yuè-Yīng and they conceived a son, Kenshiro. Tesshin once fought Wèi Ruì-Yīng, founder of Kyokujūji Sei Ken, to a draw but received a big cross-shaped scar on his back. He remarked that Ruì-Yīng may have been able to defeat him had he not lost a leg. He also beat the hermit Lǐ Sǎn's Shadowless Kick. For reasons unknown, Tesshin never told Kenshirō about his homeland (China) or his mother.