Rokujo Chikage is a biker gang leader whose members were attacked

Spoiler

by Dollars (actually Blue Square that claimed to be Dollars).

He is a strong fighter, who fought Shizuo in the 5th novel. He and Kadota were fighting at the end of 6th novel. Chikage is a ladies man who has a throng of girls follow him around. However, like a gentleman, Chikage refuses to harm any female, enemy or not.