Mishima Genji

Joe's father. After his wife Yumiko was attacked by a thug and went into a coma, his personality changed and he started experimenting on humans. He transferred his memories into Joe's mind after he realized he won't live for long due to his many incurable diseases so he could have a new and young body, and in order to live on with Shiina, who not only resembles Yumiko, but also has her memories.