Kazuki Kazama/Story

When Sogetsu and Kazuki were infants, they were found underneath a bridge. It's unknown if they are truly related to one another but they became ninja of the Kazama clan. In Samurai Shodown V, he is ordered to execute a powerful fire-demon named Enja. He searches for the demon and eventually encounters him. Enja, however, is too powerful an opponent for Kazuki but, his younger sister, Hazuki saves his and Sogetsu's life by sealing the demons in each brother's respective weapons.

In the 2019 reboot, the 3 Kazama siblings are tasked to investigate and neutralize the ominous events. Kazuki wants to deal with the threat all by himself to prevent it from escalating and to save his siblings the trouble, and does so successfully.

In Samurai Shodown IV, after he learns that Hazuki was kidnapped by Amakusa, Kazuki decides to desert the clan to rescue her, essentially becoming a nukenin, a rogue ninja. His clan does not tolerate traitors and insubordination and they send his brother Sogetsu to assassinate him and eliminate Amakusa as well. The two rendezvous at Amakusa's castle. There, Kazuki defeats Amakusa and saves his sister. Sogetsu, on the other hand, stays behind to fight Zankuro. After faking his death to his clan, Kazuki and Hazuki continue to run away together and live a carefree life. Sogetsu on the other hand hides Kazuki and Hazuki's existence by influencing the clan's movements so that they don't encounter the two, and taking interest in the clan's leadership.

The 64 series has him pursue Yuga to first avenge the death of his foster father. Eventually, he also needs to rescue a captive Hazuki. To gain the power necessary to save his sister, he recklessly taps into power of the spirit sealed in his sword and is overwhelmed. He succeeded in saving Hazuki as well as suppressing Enja. From then on, he chooses to live a peaceful existence with Hazuki.

In Sen, he was living peacefully with Hazuki in a village. When he finds her wounded, she pleads with him to help a girl who was taken away. He leaves to carry out his sister's request. Kazuki returns from seclusion and openly helped Sogetsu eliminate his would-be killers and confront Genshinsai for ordering his and Hazuki's death. Sogetsu orders his brother to return and stay with Hazuki after the ordeal, after witnessing Genshinsai commit suicide.

In the alternate continuity of Samurai Shodown VI, he successfully removes his status as a Nukenin with Hazuki through Sogetsu's intervention, reintegrating into the clan and together leading successful careers as prominent shinobis.