Unlike most Mishimas (who were ruthless and power hungry), Jinpachi was a man of honor and wisdom as he showed compassion to his grandson Kazuya when the latter was a child (this is possibly another reason Heihachi resented Jinpachi so much) and was friends with Wang Jinrei. In his Tekken 5 ending, realizing no one could stop him, he shed tears as the evil spirit that possessed him grew more powerful.
Jinpachi is the father of Heihachi Mishima and the founder of the Mishima Zaibatsu. Unlike most of the Mishimas, Jinpachi is an honorable fighter with a strong sense of wisdom. He is friends with Wang Jinrei. However, Jinpachi's life takes a turn for the worse when the greedy Heihachi stages a coup d'etat and steals the company from him. Jinpachi attempts to retake the company when Heihachi enters the military industry, but fails and is imprisoned underneath a Mishima compound, Hon-Maru. Sometime later, he dies of starvation, until he is resurrected by a mysterious entity.
Having been taken over by a vengeful spirit and granted incredible supernatural powers, Jinpachi breaks out of Hon-maru when the compound is destroyed during a battle between Heihachi, Kazuya and an army of Jack-4's sent to kill Heihachi. With the news of Heihachi's apparent demise, Jinpachi takes over the company from behind the scenes and organizes the fifth King of Iron Fist Tournament in the hopes that someone will free him before the spirit takes him over completely (to the point that he writes to Wang, asking him to compete and put an end to the Mishima bloodline which has been cursed by Heihachi's greedy ambitions).
In the tournament final, Jinpachi is confronted by his great-grandson, Jin Kazama, who defeats him and puts him to rest at last.
Ending Description: Jinpachi laments that nobody was able to defeat him, and transforms into a much more demonic form as the spirit takes him over completely. This ending is only shown when the player loses to Jinpachi and decides not to continue.