Who is the adopted son of Heihachi Mishima?

Lee Chaolan is the adopted son of Heihachi Mishima. Heihachi adopted Lee to create a rival for his biological son, Kazuya, whom he considered too weak to lead the Mishima Zaibatsu.

Lee was born in China and later studied in the United States alongside Paul Phoenix and Marshall Law. His adoption placed him inside the Mishima family's dangerous power struggle, but his relationship with Kazuya was defined more by rivalry than brotherly loyalty. After Kazuya took control of the Zaibatsu, Lee served as his secretary while secretly hoping to seize the company himself.

Players sometimes choose Kazuya Mishima because Kazuya is Heihachi's biological son, but the question asks for an adopted son. Lars Alexandersson is another relative connected to Heihachi: he is Heihachi's illegitimate biological son, not his adopted child. Jin Kazama is Heihachi's grandson through Kazuya and Jun Kazama.

After Heihachi disowned him, Lee left the fighting world and built a robotics career. He later returned under the alias Violet and developed Combot, making technology and entrepreneurship central parts of his character.