Thank you for the wild ride.
It seems like the demon lord's final, ultimate attack wasn't aimed at Rize? What if he killed the manga instead? He found the true way to cease Rize's shamelessness.
The yakuza dialect is just an ultra masculine, direct and harsher version of whatever dialect they speak in their area. It doesn't need to sound like drunk slur. It just requires ruder, confrontational and more boasting word choices. Like instead of "I don't know what the giant god is." You...