There are only nine groups.

The nine retainers of Kozuki Oden, the "Daimyo" of Kuri in Wano, are Kinemon, Denjiro, Kuotan Kanjuro, Kikunojo, Raizo, Ashura Doji, Kawamatsu, Inuarashi, Neko Viper composition.

The Nine Red Scabbard Heroes is a very important setting in the Wano Country Chapter. Legend has it that when the Kozuki clan was destroyed, Mrs. Kozuki made a prophecy that the Nine Red Scabbard Heroes would be here 20 years later. Kill the big snake and let the country of Wano be founded! Revenge for the Guangyue clan.

Extended information:

41 years ago, in the Flower City, the Mountain God Incident broke out. Kinemon was rescued by Kozuki Oden and voluntarily followed him. Denjiro, who originally worshiped Oden, also Follow along. After the bell, two brothers, Izo and Kikunojo, who were living on the streets, were taken in by Kozuki Oden.

In Nozomi, Kanjuro, known as a monster, was subdued by Kozuki Oden. In Rabbit Bowl, the ninja Raizo of the Kozuki family who quit the Imperial Court Fans was accepted by Kozuki Oden. In Kuri, the notorious monster Asura Doji was defeated and subdued by Kozuki Oden.

Thirty-three years ago, young Kawamatsu, Inuarashi, and Neko Viper were tied up as monsters at the beach, and were rescued and taken in by Kozuki Oden.

Reference: Baidu Encyclopedia-Nine Red Scabbard Heroes