Most ninja in Naruto fight for the village they were born in, but there are a number who decided to leave their respective villages to become rogue ninja. The Akatsuki was a criminal organization that was mainly composed of rogue ninja from several villages. The Akatsuki consisted of ten members, so they were forced to recruit only the best. That being said, there were a number of viable ninja that the group could have recruited to bolster their ranks.
Source：https://www.cbr.com/potential-naruto-akatsuki-members/
