Heihachi Mishima

Heihachi Mishima is a fictional Japanese character in the Tekken fighting game series. He is one of only four characters (the others being Paul Phoenix, Nina Williams and Yoshimitsu) to have appeared in every game in the series. The official backstory for each game somehow involves Heihachi or his immediate actions, and he makes two appearances within the series as the main antagonist (in both Tekken and Tekken 4), marking him as one of series' central characters. Heihachi is the son of Jinpachi Mishima, the father of Kazuya Mishima and Lars Alexandersson (though he is unaware of this), the adopted father of Lee Chaolan and the grandfather of Jin Kazama. He fights with the power of Mishima Style Karate and is the founder and the Commander of the Tekken Force Unit. He has hosted all but the second and fifth King of Iron Fist tournaments (which were hosted by Kazuya and Jinpachi, respectively). Heihachi was born as the heir to the rich, powerful, and well-respected Jinpachi Mishima, the owner of the powerful Mishima Zaibatsu and a world-famous martial arts master. During this time, Heihachi married and eventually had a son of his own, Kazuya. Heihachi raised Kazuya harshly; in his mind, he needed to forge a strong heir to eventually pass the Mishima Zaibatsu to. Much to his chagrin, Kazuya grew up kind and frail.

(Source: Tekken Wikia)