Legendary, beloved Like a Dragon / Yakuza characters such as Kazuma Kiryu and Goro Majima are unlikely to appear as guest fighters in series like Tekken or Street Fighter. That's despite developer RGG Studios getting plenty of offers for such combative crossovers, which would much prefer the path of transmedia adaptations to guest collaborations.
Polygon asked Like a Dragon series producer and writer Masayoshi Yokoyama how he'd feel about characters like Kiryu, Majima, or even Ichiban appearing in a fighter like Tekken 8, to which he replied: "I think it's better to say that going across mediums like how we did with [Like a Dragon: Yakuza] series is better, rather than just going to another game."
It's not for a lack of offers, as Yokoyama reveals: "We receive all kind of invitations to appear in other games, but we never actually went over to their doorstep and said 'let us in.' I think going cross-medium is the better way to go about it." Perhaps RGG doesn't want its stars sharing the spotlight, eh?