A thought I had about numbered heroes
The number doesn’t indicate the rank of a hero, it indicates what kind of hero they are. For example, Sportacus is number 10, and so his duties as a hero involve educating children, stopping minor villainy, that sort of thing. A different number would mean different duties, such as more magical involvement, stopping violent crimes, working with local authorities, performing research, etc. You wouldn’t change numbers by being promoted, but by training in different things.