Kazumi Mishima nee Hachijo is a character in the Tekken series. She is the late wife of Heihachi Mishima, the late daughter-in-law of Jinpachi Mishima, the late mother of Kazuya Mishima and the late paternal grandmother of Jin Kazama. She was introduced in Tekken 7 as a new character, and as the antagonist of the game.
The existence of the character before Tekken 7 was alluded to twice: the first time was in Heihachi's Tekken 2 stage, in which their names ("Heihachi and Kazumi") are written on the floorboard of the temple in the style of Aiaigasa, a romantic expression to show the love between couples (the floor carving mark itself was later seen again in the very first trailer of Tekken 7). The second and last time was in the non-canon OVA film Tekken: The Motion Picture, where she was simply referred to as "Kazumi." Her name was also briefly mentioned in Tekken 2's musical score.
Kazumi Mishima, the wife of Heihachi Mishima, is well versed in Hachijō Karate. She was childhood friends with her husband Heihachi and eventually, they fell in love. Through their love, they birthed a healthy young boy. Fast forward a few years later, Heihachi would become the head of a huge organization called the Mishima Zaibatsu, with plans to conquer the world.
Kazumi loved Heihachi unconditionally, but at the same time, he was beginning to feel dangerous. In this state, Heihachi threw the world into war and Kazumi took it upon herself to stop him.
Many years ago, Kazumi arrived at Jinpachi Mishima's dojo when she was a young girl. As she trained alongside Heihachi Mishima, they became fierce rivals and eventually fell in love. They married, and Kazumi then gave birth to their son, Kazuya. She was enamored by and doted on him. But the family's days of happiness came to an end one day when Kazumi collapsed with a fever during training. While Heihachi was treating her, she got up and suddenly attacked him. The next day, Kazumi had no recollection of what she did to her husband, and her fever was gone. For a while, Heihachi believed that Kazumi was suffering from a split personality disorder. But on one stormy night, his belief was proven incorrect. At some point, she found an injured Akuma out of nowhere and secretly tended his wounds. Desiring to repay this debt, Akuma offered to help Kazumi. Kazumi asked him to eliminate Heihachi, and later Kazuya, should she fail and should Kazuya walk the same path as Heihachi.
While Heihachi was practicing his martial arts moves in the dojo, Kazumi confronted him and proclaimed that he would one day become a threat to the world. As they fought, Kazumi revealed to Heihachi the reason she married him in the first place. Her family, the Hachijo Clan, wanted to kill him and it was her destiny to destroy him, as she finally assumed in her devil form. After a long and grueling fight, Kazumi attempted to kill Heihachi with a Devil's Beam but missed, prompting her to punch him in the face. But Heihachi retaliated by hitting her groin with a powerful uppercut, seemingly killing her while she reverted to her human form. After Heihachi checked upon her body and turned to leave, Kazumi transformed into her devil form again to attack him from behind. He turned in time, however, and grabbed her by the neck. Desperate, Kazumi warned her husband about the chain of hatred and begged him to release her because of their love for one another. Despite her pleas, Heihachi noticed it was a trap and stated to her that she was no longer the Kazumi that he knew. He snapped her neck, killing her. As Kazumi lay dead on the floor, Heihachi shed a single tear over the loss of his wife. Her death also led her son, Kazuya, to take revenge against Heihachi for killing his mother. It was revealed that Kazumi’s death was the same year as Heihachi’s war against Jinpachi, and the same year that Heihachi threw five-year-old Kazuya from a cliff.
Kazumi's story and death are recounted years later by Heihachi when he reveals the dark secrets of the Mishima family to an investigative journalist.
She will be voiced by Carrie Keranen in the English dub, but she is reprised by Yumi Hara in the Japanese dub.