The emergence of “guests” characters in fighting games has become a regular thing for the time being. We watched the Super Smash game which adds many third-party characters as well as Sol Caliber, Tekken and other games.
Katsuhiro Harada, a game producer of the Bandai Namco series Tekken fighting, wanted to add the Kazuma Kiryu character from the Yakuza series to the seventh part of his series as a new additional character, but he faced a rejection from the management of the Bandai Namco company that sent him a message that his personal appearance in the Yakuza series games seems more realistic.