Harada Explains Heihachi Mishima’s Illegitimate Children in Tekken

Now that Heihachi Mishima is about to debut as Tekken 8 DLC, Producer Katsuhiro Harada took to social media to discuss the character’s family line and illegitimate children and explain why there are so many. Essentially, it comes down to the Devil Gene and determining how it is connected to the Mishima family line.

Editor’s Note: There will be spoilers for Heihachi Mishima, his children and family, and Tekken 8 characters below.

This all started after Harada retweeted a comic featuring Heihachi Mishima and Reina. When doing so, he commented on the relationship between the two and noted, “Heihachi has numerous illegitimate children.”

Harada then followed that statement with another comment that included extended commentary on the family line. In that tweet, he noted that there are many illegitimate children who would call Heihachi Mishima “dad,” aside from the ones we know about, as part of an investigation into Devil Gene inheritance. 

We know that Heihachi had Kazuya with his wife Kazumi. In Tekken 6, Lars Alexandersson appeared. It turned out he is also Heihachi’s son. Then in Tekken 8, Reina was introduced and revealed to be his daughter. Based on the events of Tekken 7, we know that Kazumi carried the Devil Gene. 

Tekken 8 is available on the PS5, Xbox Series X, and PC, and Heihachi will appear as DLC on October 4, 2024.